gpu: nvgpu: move fifo init/deinit code to common

Add fifo sub-unit to common.fifo to handle init/deinit code
and global support functions.

Split init into:
- nvgpu_channel_setup_sw
- nvgpu_tsg_setup_sw
- nvgpu_fifo_setup_sw
- nvgpu_runlist_setup_sw
- nvgpu_engine_setup_sw
- nvgpu_userd_setup_sw
- nvgpu_pbdma_setup_sw

Split de-init into
- nvgpu_channel_cleanup_sw
- nvgpu_tsg_cleanup_sw
- nvgpu_fifo_cleanup_sw
- nvgpu_runlist_cleanup_sw
- nvgpu_engine_cleanup_sw
- nvgpu_userd_cleanup_sw
- nvgpu_pbdma_cleanup_sw

Added the following HALs
- runlist.length_max
- fifo.init_pbdma_info
- fifo.userd_entry_size

Last 2 HALs should be moved resp. to pbdma and userd sub-units,
when available.

Added vgpu implementation of above hals
- vgpu_runlist_length_max
- vgpu_userd_entry_size
- vgpu_channel_count

Use hals in vgpu_fifo_setup_sw.

Jira NVGPU-1306

Change-Id: I954f56be724eee280d7b5f171b1790d33c810470
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2029620
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/os/linux/linux-channel.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2018, NVIDIA Corporation.  All rights reserved.
+ * Copyright (c) 2017-2019, NVIDIA Corporation.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -526,7 +526,7 @@ free_gpfifo:
 	return err;
 }
 
-int nvgpu_init_channel_support_linux(struct nvgpu_os_linux *l)
+int nvgpu_channel_init_support_linux(struct nvgpu_os_linux *l)
 {
 	struct gk20a *g = &l->g;
 	struct fifo_gk20a *f = &g->fifo;
@@ -577,7 +577,7 @@ err_clean:
 	return err;
 }
 
-void nvgpu_remove_channel_support_linux(struct nvgpu_os_linux *l)
+void nvgpu_channel_remove_support_linux(struct nvgpu_os_linux *l)
 {
 	struct gk20a *g = &l->g;
 	struct fifo_gk20a *f = &g->fifo;