dt/bindings: rockchip: add the power domains for rk3036 SoCs

This patch add the binding documentation for power domains found on
Rockchip rk3036 SoCs.

Change-Id: I45ff200e4d891724633fe97bdc349faad82a2984
Signed-off-by: Caesar Wang <wxt@rock-chips.com>

Author: Caesar-github

Documentation/devicetree/bindings/soc/rockchip/power_domain.txt

@@ -5,6 +5,7 @@ powered up/down by software based on different application scenes to save power.
 
 Required properties for power domain controller:
 - compatible: Should be one of the following.
+	"rockchip,rk3036-power-controller" - for RK3036 SoCs.
 	"rockchip,rk3128-power-controller" - for RK3128 SoCs.
 	"rockchip,rk3288-power-controller" - for RK3288 SoCs.
 	"rockchip,rk3328-power-controller" - for RK3328 SoCs.
@@ -18,6 +19,7 @@ Required properties for power domain controller:
 
 Required properties for power domain sub nodes:
 - reg: index of the power domain, should use macros in:
+	"include/dt-bindings/power/rk3036-power.h" - for RK3036 type power domain.
 	"include/dt-bindings/power/rk3128-power.h" - for RK3128 type power domain.
 	"include/dt-bindings/power/rk3288-power.h" - for RK3288 type power domain.
 	"include/dt-bindings/power/rk3328-power.h" - for RK3328 type power domain.
@@ -95,6 +97,7 @@ Node of a device using power domains must have a power-domains property,
 containing a phandle to the power device node and an index specifying which
 power domain to use.
 The index should use macros in:
+	"include/dt-bindings/power/rk3036-power.h" - for rk3036 type power domain.
 	"include/dt-bindings/power/rk3128-power.h" - for rk3128 type power domain.
 	"include/dt-bindings/power/rk3288-power.h" - for rk3288 type power domain.
 	"include/dt-bindings/power/rk3328-power.h" - for rk3328 type power domain.