arm: mvebu: add support for boot from SATA

Add the required Kconfig and macro definitions to allow boot from SATA
on Armada 38x systems.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
4 files changed