PM / AVS: rockchip-io: add io selectors and supplies for rk3228

This adds the necessary data for handling io voltage domains on the rk3228.

Signed-off-by: David Wu <david.wu@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>