The Olimex A20-SOM-EVB is an evaluation board for the Olimex
A20-SOM system-on-module. The baseboard provides a full-size SD
socket (connected to mmc3) in addition to the micro-SD socket on
the SOM itself (which is connected to mmc0).
Enable the mmc3 controller in the board defconfig.
Signed-off-by: Karsten Merker <merker@debian.org> Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>