drm/amdgpu/gfx10: add clockgating support for navi14

Same as navi10.
Signed-off-by: Xiaojie Yuan <xiaojie.yuan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Jack Xiao <Jack.Xiao@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c

@@ -4078,6 +4078,7 @@ static int gfx_v10_0_set_clockgating_state(void *handle,
 
 	switch (adev->asic_type) {
 	case CHIP_NAVI10:
+	case CHIP_NAVI14:
 		gfx_v10_0_update_gfx_clock_gating(adev,
 						 state == AMD_CG_STATE_GATE ? true : false);
 		break;