Patch merged into coreboot/master: buildgcc: Rename armv7-a-eabi compiler to arm-eabi

the following patch was just integrated into master:
commit 27522ad375aa43ab9d321b049da78b8e649ca537
Author: Stefan Reinauer 
Date:   Fri Jan 29 17:31:34 2016 -0800

buildgcc: Rename armv7-a-eabi compiler to arm-eabi

The compiler really supports a whole line of ARM CPUs, not just
    ARMv7a:
    arm-eabi-gcc: note: valid arguments to '-march=' are: armv2 armv2a
       armv3 armv3m armv4 armv4t armv5 armv5e armv5t armv5te armv6 armv6-m
       armv6j armv6k armv6s-m armv6t2 armv6z armv6zk armv7 armv7-a armv7-m
       armv7-r armv7e-m armv7ve armv8-a armv8-a+crc iwmmxt iwmmxt2 native
    So let's reflect this in the cross compiler name.

Change-Id: I717760d80954655b2de9ae019b813d81e9a75762
    Signed-off-by: Stefan Reinauer 
    Reviewed-on: https://review.coreboot.org/13515
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See https://review.coreboot.org/13515 for details.

-gerrit