drm/amdgpu: support cp_fw_write_wait for dimgrey_cavefish

Same as sienna_cichlid, dimgrey_cavefish supports WAIT_REG_MEM packet.
Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Jiansong Chen <Jiansong.Chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -3617,6 +3617,7 @@ static void gfx_v10_0_check_fw_write_wait(struct amdgpu_device *adev)
 	case CHIP_SIENNA_CICHLID:
 	case CHIP_NAVY_FLOUNDER:
 	case CHIP_VANGOGH:
+	case CHIP_DIMGREY_CAVEFISH:
 		adev->gfx.cp_fw_write_wait = true;
 		break;
 	default: