buildroot

toolchain-external-codesourcery-arm: Cortex-A12 and Cortex-A17 not supported

It's gcc 4.8.3 which doesn't support those cores yet.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>