[PATCH v2] ARM: Define wfi() macro for v6 processors

On Tuesday 08 February 2011, Dave Martin wrote:

CFLAGS_cpu_specific_object.o        += -march=armv7-a

Whether it's safe to do it depends on whether code from that file
could ever get run on other processors.  I'm not so sure of the answer
to that..., but perhaps someone else has a better idea.

We already do this a lot from arch/arm/mm/Makefile, and those
files are typically just one function per file, so they can easily
be proven to be safe that way.

	Arnd