dt-bindings: add power-domain header for RK3288 SoCs

According to a description from TRM, add all the power domains.

At the moment, we can support some domains on RK3288.
We can add more types on RK3288 in the future, that's need to do.
Signed-off-by: Caesar Wang <wxt@rock-chips.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

include/dt-bindings/power/rk3288-power.h

+#ifndef __DT_BINDINGS_POWER_RK3288_POWER_H__
+#define __DT_BINDINGS_POWER_RK3288_POWER_H__
+
+/**
+ * RK3288 Power Domain and Voltage Domain Summary.
+ */
+
+/* VD_CORE */
+#define RK3288_PD_A17_0		0
+#define RK3288_PD_A17_1		1
+#define RK3288_PD_A17_2		2
+#define RK3288_PD_A17_3		3
+#define RK3288_PD_SCU		4
+#define RK3288_PD_DEBUG		5
+#define RK3288_PD_MEM		6
+
+/* VD_LOGIC */
+#define RK3288_PD_BUS		7
+#define RK3288_PD_PERI		8
+#define RK3288_PD_VIO		9
+#define RK3288_PD_ALIVE		10
+#define RK3288_PD_HEVC		11
+#define RK3288_PD_VIDEO		12
+
+/* VD_GPU */
+#define RK3288_PD_GPU		13
+
+/* VD_PMU */
+#define RK3288_PD_PMU		14
+
+#endif