drm/amdgpu: enable UVD clockgating in Polaris-10/11

UVD clocks are set to be disabled, when not in use.

Signed-off-by: Maruthi Bayyavarapu <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Reviewed-by: Tom StDenis <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/vi.c

···
 		adev->external_rev_id = adev->rev_id + 0x14;
 		break;
 	case CHIP_POLARIS11:
-		adev->cg_flags = 0;
+		adev->cg_flags = AMD_CG_SUPPORT_UVD_MGCG;
 		adev->pg_flags = 0;
 		adev->external_rev_id = adev->rev_id + 0x5A;
 		break;
 	case CHIP_POLARIS10:
-		adev->cg_flags = 0;
+		adev->cg_flags = AMD_CG_SUPPORT_UVD_MGCG;
 		adev->pg_flags = 0;
 		adev->external_rev_id = adev->rev_id + 0x50;
 		break;