arm: ARM_VIRT_EXT is not supported by all v7 platforms, so it should not be enabled by default

[Sebastian Gottschall]

introduced in kernel 3.9 CONFIG_ARM_VIRT_EXT is default for all V7 arm 
cpu's. this is wrong and breaks smp support on BCM4708 for example.
so keep it optional since no all v7 cpu's seem to support it. BCM4708 
for instance is a arm cortex-a9. please merge this into one of the next 
patches.

Index: arch/arm/mm/Kconfig
===================================================================
--- arch/arm/mm/Kconfig     (revision 21211)
+++ arch/arm/mm/Kconfig     (working copy)
@@ -640,8 +640,7 @@

 config ARM_VIRT_EXT
        bool
-       depends on MMU
-       default y if CPU_V7
+       depends on MMU && CPU_V7
        help
          Enable the kernel to make use of the ARM Virtualization
          Extensions to install hypervisors without run-time firmware


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