drm/amdgpu: enable athub/mmhub PG for navy_flounder

Enable athub/mmhub PG by setting the corresponding flags.
Actually the enablement is exercised by PMFW.
Signed-off-by: Jiansong Chen <Jiansong.Chen@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -786,7 +786,9 @@ static int nv_common_early_init(void *handle)
 			AMD_CG_SUPPORT_JPEG_MGCG;
 		adev->pg_flags = AMD_PG_SUPPORT_VCN |
 			AMD_PG_SUPPORT_VCN_DPG |
-			AMD_PG_SUPPORT_JPEG;
+			AMD_PG_SUPPORT_JPEG |
+			AMD_PG_SUPPORT_ATHUB |
+			AMD_PG_SUPPORT_MMHUB;
 		adev->external_rev_id = adev->rev_id + 0x32;
 		break;