ARM: dts: am33xx: add bus functionality to base PRCM node

Add simple-bus compatibility and ranges properties to prcm node. This is
done in preparation of adding the support for clkctrl nodes.

Signed-off-by: Tero Kristo <[e-mail]>
Signed-off-by: Tony Lindgren <[e-mail]>

arch/arm/boot/dts/am33xx.dtsi

···
 			};
 
 			prcm: prcm@200000 {
-				compatible = "ti,am3-prcm";
+				compatible = "ti,am3-prcm", "simple-bus";
 				reg = <0x200000 0x4000>;
+				#address-cells = <1>;
+				#size-cells = <1>;
+				ranges = <0 0x200000 0x4000>;
 
 				prcm_clocks: clocks {
 					#address-cells = <1>;