rockchip: google: gru: Migrate to use IO-domain driver

Switch to use the IO-domain driver to configure IO-domain based on
device tree instead of a setup_iodomain() function.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/chromebook_kevin_defconfig b/configs/chromebook_kevin_defconfig
index 07a96aa..120c11c 100644
--- a/configs/chromebook_kevin_defconfig
+++ b/configs/chromebook_kevin_defconfig
@@ -67,6 +67,7 @@
 CONFIG_SYS_I2C_ROCKCHIP=y
 CONFIG_I2C_MUX=y
 CONFIG_CROS_EC_KEYB=y
+CONFIG_ROCKCHIP_IODOMAIN=y
 CONFIG_CROS_EC=y
 CONFIG_CROS_EC_SPI=y
 CONFIG_PWRSEQ=y