ARM: dts: rockchip: enable io-domain for rk3229-evb

This patch enables io-domain support for rk3229-evb board.

The power domain of VCCIO3 is selected from maskrom, so we do not
need to configure it.

Signed-off-by: David Wu <david.wu@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>