ARM: shmobile: genmai: enable CONFIG_DEVTMPFS in defconfig

DEVTMPFS is needed for udev

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/configs/genmai_defconfig

@@ -50,6 +50,8 @@ CONFIG_IP_PNP_DHCP=y
 # CONFIG_IPV6 is not set
 # CONFIG_WIRELESS is not set
 CONFIG_UEVENT_HELPER_PATH="/sbin/hotplug"
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
 CONFIG_NETDEVICES=y
 # CONFIG_NET_CORE is not set
 # CONFIG_NET_VENDOR_ARC is not set