lantiq: add 3.18 support

target/linux/lantiq/Makefile

target/linux/lantiq/config-3.18

target/linux/lantiq/dts/EASY98000NOR.dts

target/linux/lantiq/dts/EASY98000SFLASH.dts

target/linux/lantiq/dts/ar9.dtsi

target/linux/lantiq/dts/danube.dtsi

target/linux/lantiq/dts/falcon.dtsi

target/linux/lantiq/dts/vr9.dtsi

...antiq/patches-3.18/0001-MIPS-lantiq-add-pcie-driver.patch

...lantiq/patches-3.18/0002-MIPS-lantiq-dtb-image-hack.patch

....18/0003-MIPS-lantiq-handle-vmmc-memory-reservation.patch

...x/lantiq/patches-3.18/0004-MIPS-lantiq-add-atm-hack.patch

...8/0005-MIPS-lantiq-add-reset-controller-api-support.patch

...atches-3.18/0006-MIPS-lantiq-reboot-gphy-on-restart.patch

...patches-3.18/0007-MIPS-lantiq-add-basic-tffs-driver.patch

...tches-3.18/0008-MIPS-lantiq-backport-old-timer-code.patch

...ches-3.18/0009-MIPS-lantiq-command-line-work-around.patch

...antiq/patches-3.18/0010-MIPS-lantiq-export-soc-type.patch

...antiq-add-support-for-xrx200-firmware-depending-on-.patch

...ntiq/patches-3.18/0012-pinctrl-lantiq-fix-up-pinmux.patch