ARM: mstar: Add cpupll to base dtsi

All MStar/SigmaStar ARMv7 SoCs have the CPU PLL at the same
place so add it to the base dtsi.

Signed-off-by: Daniel Palmer <daniel@0x0f.com>
Reviewed-by: Romain Perier <romain.perier@gmail.com>

arch/arm/boot/dts/mstar-v7.dtsi

@@ -155,6 +155,13 @@
 				clocks = <&xtal>;
 			};
 
+			cpupll: cpupll@206400 {
+				compatible = "mstar,msc313-cpupll";
+				reg = <0x206400 0x200>;
+				#clock-cells = <0>;
+				clocks = <&mpll MSTAR_MSC313_MPLL_DIV2>;
+			};
+
 			gpio: gpio@207800 {
 				#gpio-cells = <2>;
 				reg = <0x207800 0x200>;