OMAP: Define CONFIG_OMAP3_GPIO_6 on omap3_logic

Since we are manipulating GPIO 189 to determine the board type, we
need to enable the GPIO Bank 6.

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/configs/omap3_logic.h

@@ -50,6 +50,9 @@
  * Hardware drivers
  */
 
+/* GPIO banks */
+#define CONFIG_OMAP3_GPIO_6		/* GPIO160..191 is in GPIO bank 6 */
+
 /*
  * select serial console configuration
  */