ARM: shmobile: marzen: defconfig: add GPIO RCAR driver support

This enables the driver added in "gpio: Renesas R-Car GPIO driver V3"

Cc: Magnus Damm <damm@opensource.se>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>