abuild: Select correct cross compiler for ARMV7 architecture

Change-Id: Ia0dce25a4271299757654ba46baafe6a6673c6d2
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/2000
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Tested-by: build bot (Jenkins)
1 file changed