dt-bindings: add power-domain header for RK3368 SoCs

According to a description from TRM, add all the power domains.
Signed-off-by: zhangqing <zhangqing@rock-chips.com>
Reviewed-by: Caesar Wang <wxt@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

include/dt-bindings/power/rk3368-power.h

+#ifndef __DT_BINDINGS_POWER_RK3368_POWER_H__
+#define __DT_BINDINGS_POWER_RK3368_POWER_H__
+
+/* VD_CORE */
+#define RK3368_PD_A53_L0	0
+#define RK3368_PD_A53_L1	1
+#define RK3368_PD_A53_L2	2
+#define RK3368_PD_A53_L3	3
+#define RK3368_PD_SCU_L		4
+#define RK3368_PD_A53_B0	5
+#define RK3368_PD_A53_B1	6
+#define RK3368_PD_A53_B2	7
+#define RK3368_PD_A53_B3	8
+#define RK3368_PD_SCU_B		9
+
+/* VD_LOGIC */
+#define RK3368_PD_BUS		10
+#define RK3368_PD_PERI		11
+#define RK3368_PD_VIO		12
+#define RK3368_PD_ALIVE		13
+#define RK3368_PD_VIDEO		14
+#define RK3368_PD_GPU_0		15
+#define RK3368_PD_GPU_1		16
+
+/* VD_PMU */
+#define RK3368_PD_PMU		17
+
+#endif