dt-bindings: clock: renesas: r9a06g032-sysctrl: Document power Domains

The driver is gaining power domain support, so add the new property
to the DT binding and update the examples.
Signed-off-by: Gareth Williams <gareth.williams.jx@renesas.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Documentation/devicetree/bindings/clock/renesas,r9a06g032-sysctrl.txt

@@ -13,6 +13,7 @@ Required Properties:
 	- external (optional) RGMII_REFCLK
   - clock-names: Must be:
         clock-names = "mclk", "rtc", "jtag", "rgmii_ref_ext";
+  - #power-domain-cells: Must be 0
 
 Examples
 --------
@@ -27,6 +28,7 @@ Examples
 		clocks = <&ext_mclk>, <&ext_rtc_clk>,
 				<&ext_jtag_clk>, <&ext_rgmii_ref>;
 		clock-names = "mclk", "rtc", "jtag", "rgmii_ref_ext";
+		#power-domain-cells = <0>;
 	};
 
   - Other nodes can use the clocks provided by SYSCTRL as in:
@@ -38,6 +40,7 @@ Examples
 		interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
 		reg-shift = <2>;
 		reg-io-width = <4>;
-		clocks = <&sysctrl R9A06G032_CLK_UART0>;
-		clock-names = "baudclk";
+		clocks = <&sysctrl R9A06G032_CLK_UART0>, <&sysctrl R9A06G032_HCLK_UART0>;
+		clock-names = "baudclk", "apb_pclk";
+		power-domains = <&sysctrl>;
 	};