MAINTAINERS: add entry OMAP GPIO driver

Since I've been maintaining this, making it official at the request of the
GPIO maintainers.

Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NKevin Hilman <khilman@ti.com>
[corrected file path]
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

MAINTAINERS

@@ -4943,6 +4943,13 @@ S:	Maintained
 F:	drivers/usb/*/*omap*
 F:	arch/arm/*omap*/usb*
 
+OMAP GPIO DRIVER
+M:	Santosh Shilimkar <santosh.shilimkar@ti.com>
+M:	Kevin Hilman <khilman@ti.com>
+L:	linux-omap@vger.kernel.org
+S:	Maintained
+F:	drivers/gpio/gpio-omap.c
+
 OMFS FILESYSTEM
 M:	Bob Copeland <me@bobcopeland.com>
 L:	linux-karma-devel@lists.sourceforge.net