imx: ventana: add pinctrl and remove unneeded UART init and config

Once the IMX6 pinctrl driver is added UART is fully using driver mode
so we no longer need to config and initialize it.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/configs/gwventana_emmc_defconfig b/configs/gwventana_emmc_defconfig
index 453c80d..433de5e 100644
--- a/configs/gwventana_emmc_defconfig
+++ b/configs/gwventana_emmc_defconfig
@@ -87,6 +87,8 @@
 CONFIG_E1000=y
 CONFIG_MII=y
 CONFIG_PCI=y
+CONFIG_PINCTRL=y
+CONFIG_PINCTRL_IMX6=y
 CONFIG_CONS_INDEX=2
 CONFIG_DM_SERIAL=y
 CONFIG_MXC_UART=y