ARM: davinci_all_defconfig: enable gpio poweroff driver
The gpio-poweroff driver is needed by LEGO MINDSTORMS EV3 (AM1808 based
board).
Signed-off-by: David Lechner <david@lechnology.com>
[nsekhar@ti.com: subject line adjustment]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>