gpu: nvgpu: gsp sched: create and enable gsp virtual memory access

Changes
- Initialize virtual memory for gsp. This space is used for creating
  queues for ctrl fifo. Also can be used to ro map sync-pt to this
  instance where gsp firmware can poll the sync-pt with sync-pt id.
- Enabled gsp context interface and written the instance block pointer
  to nxtctx register for the gsp firmware to access created virtual memory.
- Added required gsp registers for this feature.

NVGPU-8730
Bug 3770916

Change-Id: If538f615eca3f9b7840ffe2787826528b4808886
Signed-off-by: rmylavarapu <rmylavarapu@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2764649
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/hal/init/hal_ga10b.c

@@ -1950,6 +1950,11 @@ int ga10b_init_hal(struct gk20a *g)
 		nvgpu_set_enabled(g, NVGPU_SUPPORT_PMU_SUPER_SURFACE, true);
 	}
 
+	/*
+	 * enable GSP VM for gsp scheduler firmware
+	 */
+	nvgpu_set_enabled(g, NVGPU_SUPPORT_GSP_VM, true);
+
 	/*
 	 * ga10b bypasses the IOMMU since it uses a special nvlink path to
 	 * memory.