rockchip: io-domain: Enable by default for all supported SoCs

rockchip: io-domain: Enable by default for all supported SoCs

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>