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/module.c

@@ -204,7 +204,7 @@ int nvgpu_finalize_poweron_linux(struct nvgpu_os_linux *l)
 	if (l->init_done)
 		return 0;
 
-	err = nvgpu_init_channel_support_linux(l);
+	err = nvgpu_channel_init_support_linux(l);
 	if (err) {
 		nvgpu_err(g, "failed to init linux channel support");
 		return err;
@@ -751,7 +751,7 @@ void gk20a_remove_support(struct gk20a *g)
 
 	nvgpu_kfree(g, g->dbg_regops_tmp_buf);
 
-	nvgpu_remove_channel_support_linux(l);
+	nvgpu_channel_remove_support_linux(l);
 
 	if (g->pmu.remove_support)
 		g->pmu.remove_support(&g->pmu);