ARM: dts: rockchip: Keep rk3288-tinker SD card IO powered during reboot

IO voltage regulator for the SD card must be kept on all the time,
otherwise when the board reboots the SD card can't be read by the
bootloader.

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Link: https://lore.kernel.org/r/20200219204224.34154-1-JPEWhacker@gmail.com


Signed-off-by: Heiko Stuebner <heiko@sntech.de>