rockchip: vamrs: rock960: 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/ficus-rk3399_defconfig b/configs/ficus-rk3399_defconfig
index 90b07d8..4859042 100644
--- a/configs/ficus-rk3399_defconfig
+++ b/configs/ficus-rk3399_defconfig
@@ -42,6 +42,7 @@
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_ROCKCHIP_GPIO=y
 CONFIG_SYS_I2C_ROCKCHIP=y
+CONFIG_ROCKCHIP_IODOMAIN=y
 CONFIG_MMC_DW=y
 CONFIG_MMC_DW_ROCKCHIP=y
 CONFIG_MMC_SDHCI=y