DCE-KMD: Refactor dce-os-worker.c/.h

- dce-os-worker.c/.h module exposes functionality which allows
  DCE KMD clients to wait/signal events.

- The current abstraction of this module has following drawbacks
  which this change attempts to address:
    * Name: dce-os-worker is a misnomer
        - Rename to dce-wait-cond.c/.h and make it a dce-kmd core file.
        - Rename functions accordingly.
    * dce-os-worker module initializes data structures from tegra_dce
      which makes it ineligible for re-use.
        - dce-client-ipc can re-use this module as it uses exact
          same functionality.
        - But this module is tied with DCE-KMD core such that it has
          functions that operate on fixed known inputs.
            - dce_os_work_cond_sw_resource_init/deinit()
                Inits/Deinits most but not all condition var resources
                from tegra_dce. Eg. dce-client-ipc resources
                are not initialized.
                    - Move this function to new core file:dce-waiters.c
            - All other functions require msg_id as input and can only
              operate on DCE_WAIT* resources making it ineligible
              to be used by other clients like dce-client-ipc.
                    - Refactor these fucntions to operate on
                      individual wait conditions so that all DCE-KMD
                      core modules can reuse them.

- Additionally, this change will also remove unused functions
  and macros from dce-os-cond.c/.h

- dce-client-ipc will also switch to use dce-wait-cond interface
  for client ipc waits.

- Make dce-os-cond.h a common file and move OS specific impl
  to dce-os-cond-internal.h

JIRA TDS-16581

Change-Id: Ie8c6ec724e48cde66917fab4aa43e7da464ef8fb
Signed-off-by: anupamg <anupamg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3258562
Reviewed-by: Vinod Gopalakrishnakurup <vinodg@nvidia.com>
Reviewed-by: Arun Swain <arswain@nvidia.com>

drivers/platform/tegra/dce/dce-os-utils.c

@@ -272,13 +272,6 @@ void dce_os_log_msg(struct tegra_dce *d, const char *func_name, int line,
 	dce_print(func_name, line, type, log);
 }
 
-/**
- * dce_os_cond_init - Initialize a condition variable
- *
- * @cond - The condition variable to initialize
- *
- * Initialize a condition variable before using it.
- */
 int dce_os_cond_init(struct dce_os_cond *cond)
 {
 	init_waitqueue_head(&cond->wq);
@@ -287,43 +280,11 @@ int dce_os_cond_init(struct dce_os_cond *cond)
 	return 0;
 }
 
-/**
- * dce_os_cond_destroy - Destroy a condition variable
- *
- * @cond - The condition variable to destroy
- */
 void dce_os_cond_destroy(struct dce_os_cond *cond)
 {
 	cond->initialized = false;
 }
 
-/**
- * dce_os_cond_signal - Signal a condition variable
- *
- * @cond - The condition variable to signal
- *
- * Wake up a waiter for a condition variable to check if its condition has been
- * satisfied.
- *
- * The waiter is using an uninterruptible wait.
- */
-void dce_os_cond_signal(struct dce_os_cond *cond)
-{
-	WARN_ON(!cond->initialized);
-
-	wake_up(&cond->wq);
-}
-
-/**
- * dce_os_cond_signal_interruptible - Signal a condition variable
- *
- * @cond - The condition variable to signal
- *
- * Wake up a waiter for a condition variable to check if its condition has been
- * satisfied.
- *
- * The waiter is using an interruptible wait.
- */
 void dce_os_cond_signal_interruptible(struct dce_os_cond *cond)
 {
 	WARN_ON(!cond->initialized);
@@ -331,37 +292,6 @@ void dce_os_cond_signal_interruptible(struct dce_os_cond *cond)
 	wake_up_interruptible(&cond->wq);
 }
 
-/**
- * dce_os_cond_broadcast - Signal all waiters of a condition variable
- *
- * @cond - The condition variable to signal
- *
- * Wake up all waiters for a condition variable to check if their conditions
- * have been satisfied.
- *
- * The waiters are using an uninterruptible wait.
- */
-int dce_os_cond_broadcast(struct dce_os_cond *cond)
-{
-	if (!cond->initialized)
-		return -EINVAL;
-
-	wake_up_all(&cond->wq);
-
-	return 0;
-}
-
-/**
- * dce_os_cond_broadcast_interruptible - Signal all waiters of a condition
- * variable
- *
- * @cond - The condition variable to signal
- *
- * Wake up all waiters for a condition variable to check if their conditions
- * have been satisfied.
- *
- * The waiters are using an interruptible wait.
- */
 int dce_os_cond_broadcast_interruptible(struct dce_os_cond *cond)
 {
 	if (!cond->initialized)