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/include/dce.h

@@ -13,7 +13,7 @@
 #include <dce-os-lock.h>
 #include <dce-os-cond.h>
 #include <dce-regs.h>
-#include <dce-os-worker.h>
+#include <dce-wait-cond.h>
 #include <dce-fsm.h>
 #include <dce-pm.h>
 #include <dce-mailbox.h>
@@ -27,6 +27,13 @@
 		} \
 	} while (0)
 
+#define DCE_WARN_ON_NULL(x) \
+	do { \
+		if (x == NULL) { \
+			dce_os_warn(d, "Unexpected NULL value for " #x "\n"); \
+		} \
+	} while (0)
+
 #define DCE_MAX_CPU_IRQS 4
 
 /**
@@ -79,6 +86,16 @@
 #define DCE_ADMIN_CH_CL_DBG_BUFF_COUNT		1U
 #define DCE_ADMIN_CH_CL_DBG_PERF_BUFF_COUNT	1U
 
+/**
+ * DCE Wait condition IDs.
+ */
+#define DCE_WAIT_BOOT_COMPLETE		0
+#define DCE_WAIT_BOOT_CMD		1
+#define DCE_WAIT_ADMIN_IPC		2
+#define DCE_WAIT_SC7_ENTER		3
+#define DCE_WAIT_LOG			4
+#define DCE_MAX_WAIT			5
+
 struct tegra_dce;
 
 /**
@@ -398,6 +415,9 @@ struct dce_ipc_message *dce_admin_channel_client_buffer_get(
 void dce_admin_channel_client_buffer_put(
 	struct tegra_dce *d, struct dce_ipc_message *pmsg);
 
+int dce_waiters_init(struct tegra_dce *d);
+void dce_waiters_deinit(struct tegra_dce *d);
+
 /**
  * Functions to be used in debug mode only.
  *