MX31: mx31pdk: make use of GPIO framework

Signed-off-by: Stefano Babic <sbabic@denx.de>

include/configs/mx31pdk.h

@@ -61,6 +61,7 @@
 #define CONFIG_MXC_UART
 #define CONFIG_SYS_MX31_UART1
 #define CONFIG_HW_WATCHDOG
+#define CONFIG_MXC_GPIO
 
 #define CONFIG_HARD_SPI
 #define CONFIG_MXC_SPI