configs: r8a77980: Condor: Enable MMC support by default

This enables MMC support, which is available
on Condor board, by default.

Signed-off-by: Andrey Dolnikov <andrey.dolnikov@cogentembedded.com>
Signed-off-by: Valentine Barshak <valentine.barshak@cogentembedded.com>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>