ARM: ux500: Include the PRCMU's Secure Registers in DB8500's DT

Currently we only include the PRCMU's primary registers when
referencing the register count in the 'reg' property. This patch
expands that count to include the secure registers also.
Signed-off-by: NLee Jones <lee.jones@linaro.org>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/dbx5x0.dtsi

@@ -191,7 +191,7 @@
 
 		prcmu: prcmu@80157000 {
 			compatible = "stericsson,db8500-prcmu";
-			reg = <0x80157000 0x1000>;
+			reg = <0x80157000 0x2000>;
 			reg-names = "prcmu";
 			interrupts = <0 47 0x4>;
 			#address-cells = <1>;