ARM: imx: Include on-SoM microSD in list of i.MX6 DHCOM boot devices

Add mmc1, which is mapped to optional on-SoM microSD socket,
to the list of distro boot command boot devices.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Fabio Estevam <festevam@denx.de>
1 file changed