x86: gpio: Allow the pinctrl driver to set up the pin config

Rather than setting up the pin configuration in the GPIO driver, use the
new pinctrl driver to do it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/configs/minnowmax_defconfig b/configs/minnowmax_defconfig
index fedd511..ea39e6a 100644
--- a/configs/minnowmax_defconfig
+++ b/configs/minnowmax_defconfig
@@ -20,6 +20,8 @@
 # CONFIG_CMD_NFS is not set
 CONFIG_CMD_BOOTSTAGE=y
 CONFIG_OF_CONTROL=y
+CONFIG_REGMAP=y
+CONFIG_SYSCON=y
 CONFIG_CPU=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_GIGADEVICE=y