ARM: realview: fix up PB11MP flash compat strings

The two flash memories in the PB11MPCore have their VPP/WP
lines controlled from the system controller add-on in the MTD
subsystem. "arm,versatile-flash" is the first compatible string
to use to get the right support.

Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/arm-realview-pb11mp.dts

@@ -230,14 +230,14 @@
 
 	flash0@40000000 {
 		/* 2 * 32MiB NOR Flash memory */
-		compatible = "arm,vexpress-flash", "cfi-flash";
+		compatible = "arm,versatile-flash", "cfi-flash";
 		reg = <0x40000000 0x04000000>;
 		bank-width = <4>;
 	};
 
 	flash1@44000000 {
 		// 2 * 32MiB NOR Flash memory
-		compatible = "arm,vexpress-flash", "cfi-flash";
+		compatible = "arm,versatile-flash", "cfi-flash";
 		reg = <0x44000000 0x04000000>;
 		bank-width = <4>;
 	};