uboot-imx

ARM: rmobile: Imply SoC per board

Imply all SoCs supported by a given board. This allows building single
U-Boot binary for boards which can have multiple SoCs.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>