ARM: enable fhandle in multi_v7_defconfig

CONFIG_FHANDLE is required by systemd >= 210 to spawn a serial TTY.
Signed-off-by: NAlexandre Courbot <acourbot@nvidia.com>
Acked-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NArnd Bergmann <arnd@arndb.de>

arch/arm/configs/multi_v7_defconfig

 CONFIG_SYSVIPC=y
+CONFIG_FHANDLE=y
 CONFIG_IRQ_DOMAIN_DEBUG=y
 CONFIG_NO_HZ=y
 CONFIG_HIGH_RES_TIMERS=y