ARM: exynos_defconfig: Enable CONFIG_FHANDLE

CONFIG_FHANDLE is required by systemd, which is the default init system
in more and more distributions. So lets enable it for Exynos as well
(it's already enabled in multi_v7_defconfig)

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Reviewed-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Andreas Faerber <afaerber@suse.de>
Signed-off-by: Kukjin Kim <kgene@kernel.org>