ARM: dts: rockchip: fix rk3288 power-domain unit names

The power-domain sub-nodes do have reg properties, but so far are
missing the expected unit names. So add the missing ones.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Rob Herring <robh@kernel.org>

arch/arm/boot/dts/rk3288.dtsi

@@ -659,7 +659,7 @@ power: power-controller {
 			 *	*_HDMI		HDMI
 			 *	*_MIPI_*	MIPI
 			 */
-			pd_vio {
+			pd_vio@RK3288_PD_VIO {
 				reg = <RK3288_PD_VIO>;
 				clocks = <&cru ACLK_IEP>,
 					 <&cru ACLK_ISP>,
@@ -692,7 +692,7 @@ pd_vio {
 			 * Note: The following 3 are HEVC(H.265) clocks,
 			 * and on the ACLK_HEVC_NIU (NOC).
 			 */
-			pd_hevc {
+			pd_hevc@RK3288_PD_HEVC {
 				reg = <RK3288_PD_HEVC>;
 				clocks = <&cru ACLK_HEVC>,
 					 <&cru SCLK_HEVC_CABAC>,
@@ -704,7 +704,7 @@ pd_hevc {
 			 * (video endecoder & decoder) clocks that on the
 			 * ACLK_VCODEC_NIU and HCLK_VCODEC_NIU (NOC).
 			 */
-			pd_video {
+			pd_video@RK3288_PD_VIDEO {
 				reg = <RK3288_PD_VIDEO>;
 				clocks = <&cru ACLK_VCODEC>,
 					 <&cru HCLK_VCODEC>;
@@ -714,7 +714,7 @@ pd_video {
 			 * Note: ACLK_GPU is the GPU clock,
 			 * and on the ACLK_GPU_NIU (NOC).
 			 */
-			pd_gpu {
+			pd_gpu@RK3288_PD_GPU {
 				reg = <RK3288_PD_GPU>;
 				clocks = <&cru ACLK_GPU>;
 			};