[ARM] Allow SMP if Realview MPcore is selected

This patch puts into place the final piece of the puzzle for SMP
support on ARM.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/Kconfig

@@ -324,7 +324,7 @@ menu "Kernel Features"
 
 config SMP
 	bool "Symmetric Multi-Processing (EXPERIMENTAL)"
-	depends on EXPERIMENTAL && BROKEN #&& n
+	depends on EXPERIMENTAL && REALVIEW_MPCORE
 	help
 	  This enables support for systems with more than one CPU. If you have
 	  a system with only one CPU, like most personal computers, say N. If