ARM: vexpress: Enable A7 cores in V2P-CA15_A7's Device Tree

As the kernel is able to cope with multiple clusters,
uncomment the A7 cores in the Device Tree for V2P-CA15_A7
tile, making all 5 cores available to the user.
Signed-off-by: Pawel Moll <pawel.moll@arm.com>

arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts

@@ -45,7 +45,6 @@ cpu1: cpu@1 {
 			reg = <1>;
 		};
 
-/* A7s disabled till big.LITTLE patches are available...
 		cpu2: cpu@2 {
 			device_type = "cpu";
 			compatible = "arm,cortex-a7";
@@ -63,7 +62,6 @@ cpu4: cpu@4 {
 			compatible = "arm,cortex-a7";
 			reg = <0x102>;
 		};
-*/
 	};
 
 	memory@80000000 {