TI:armv7: Enable CONFIG_CMD_GPIO

Add the generic "poke a GPIO" command, with the GPIO related defines.

Acked-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Tom Rini <trini@ti.com>

include/configs/ti_armv7_common.h

@@ -80,6 +80,7 @@
 
 /* GPIO block */
 #define CONFIG_OMAP_GPIO
+#define CONFIG_CMD_GPIO
 
 /*
  * GPMC NAND block.  We support 1 device and the physical address to