ARM: Fix Makefile to use -march=armv7-a

This seems to be the right naming and allows using vanilla gcc.

See also:

http://sourceware.org/ml/binutils/2006-12/msg00149.htmlSigned-off-by: Koen Kooi <k.kooi@student.utwente.nl>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/Makefile

@@ -47,7 +47,7 @@ comma = ,
 # Note that GCC does not numerically define an architecture version
 # macro, but instead defines a whole series of macros which makes
 # testing for a specific architecture or later rather impossible.
-arch-$(CONFIG_CPU_32v7)		:=-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7a,-march=armv5t -Wa$(comma)-march=armv7a)
+arch-$(CONFIG_CPU_32v7)		:=-D__LINUX_ARM_ARCH__=7 $(call cc-option,-march=armv7-a,-march=armv5t -Wa$(comma)-march=armv7-a)
 arch-$(CONFIG_CPU_32v6)		:=-D__LINUX_ARM_ARCH__=6 $(call cc-option,-march=armv6,-march=armv5t -Wa$(comma)-march=armv6)
 # Only override the compiler option if ARMv6. The ARMv6K extensions are
 # always available in ARMv7