Add uSD card and eMMC support to the iwg23s single board
computer powered by the RZ/G1C SoC (a.k.a. r8a77470).
Signed-off-by: Fabrizio Castro <fabrizio.castro@bp.renesas.com>
Reviewed-by: Biju Das <biju.das@bp.renesas.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>