omap4_panda: Build in cmd_gpio support on panda

Enable the gpio command

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Cc: Joe Hershberger <joe.hershberger@gmail.com>
Cc: Sandeep Paulraj <s-paulraj@ti.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

include/configs/omap4_panda.h

@@ -35,6 +35,9 @@
 
 #include <configs/omap4_common.h>
 
+/* GPIO */
+#define CONFIG_CMD_GPIO
+
 /* ENV related config options */
 #define CONFIG_ENV_IS_NOWHERE