gpu: nvgpu: move fifo_gk20a.[ch] to hal/fifo

Move fifo_gk20a struct to fifo.h
Move fifo_gk20a.[ch] to hal/fifo

Add missing includes for fifo subunits.

JIRA NVGPU-2012

Change-Id: I8bf5402bd5a9f8ff9f6a818cee553b57e117f3bc
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2109012
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/os/linux/debug_fifo.c

@@ -23,6 +23,7 @@
 #include <nvgpu/channel.h>
 #include <nvgpu/gr/ctx.h>
 #include <nvgpu/engines.h>
+#include <nvgpu/runlist.h>
 #include <nvgpu/profile.h>
 
 void __gk20a_fifo_profile_free(struct nvgpu_ref *ref);