The IO domain driver controls the I/O voltage for various pins, MMC included. Enable it by default for all supported Rockchip SoCs. Signed-off-by: Chen-Yu Tsai <wens@csie.org> Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de> Reviewed-by: Paul Kocialkowski <paulk@sys-base.io> Reviewed-by: Jonas Karlman <jonas@kwiboo.se> Reviewed-by: Anand Moon <linux.amoon@gmail.com>