Add pending patches to add RTL8231 support as a MDIO-bus attached
multi-functional device. This includes subdrivers for the pincontrol and
GPIO features, as well as the LED matrix support.
Leave the drivers disabled until required by a device.
Cherry picked from commit 6ef6014887, but
dropped already picked patch for gpio-regmap request/free, and rebased
configs
Signed-off-by: Sander Vanheule <sander@svanheule.net>
07ebd87bd1