drm/amdgpu: enable HDP clock gating for rn

Enable HDP light sleep clock gating.
Signed-off-by: NPrike Liang <Prike.Liang@amd.com>
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc15.c

@@ -1166,7 +1166,8 @@ static int soc15_common_early_init(void *handle)
 				 AMD_CG_SUPPORT_MC_LS |
 				 AMD_CG_SUPPORT_SDMA_MGCG |
 				 AMD_CG_SUPPORT_SDMA_LS |
-				 AMD_CG_SUPPORT_BIF_LS;
+				 AMD_CG_SUPPORT_BIF_LS |
+				 AMD_CG_SUPPORT_HDP_LS;
 		adev->pg_flags = 0;
 		adev->external_rev_id = adev->rev_id + 0x91;