gpu: nvgpu: update tpc-pg support

- Add tpc count variable in the platform struct
  to store the number of tpcs present in the  chip.
  This count is needed before GPU boots to provide
  support for static TPC-PG feature.
- Remove valid_tpc_pg_mask and valid_gpc_fbp_pg_mask
  variable from gk20a struct as it is already taken care
  in platform struct.

JIRA NVGPU-8210

Change-Id: Ic04af4b7c24f5e790c52708c117e45a3bb0d1810
Signed-off-by: Divya <dsinghatwari@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2725960
(cherry picked from commit e9cfae46eb7788e6d12ccd9354ecc46753aba5ce)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2728941
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Mahantesh Kumbar <mkumbar@nvidia.com>
GVS: Gerrit_Virtual_Submit

drivers/gpu/nvgpu/os/linux/platform_gk20a.h

@@ -126,6 +126,9 @@ struct gk20a_platform {
 
 	/* Valid GPC-PG and FBP-PG mask */
 	u32 valid_gpc_fbp_pg_mask[MAX_PG_GPC_FBP_CONFIGS];
+
+	/* available TPC count in a chip */
+	u32 tpc_count;
 #endif
 	/* Delay before rail gated */
 	int railgate_delay_init;