mvebu: add linux 4.9 support

target/linux/mvebu/Makefile

target/linux/mvebu/base-files/lib/preinit/06_set_iface_mac

target/linux/mvebu/config-4.9

target/linux/mvebu/patches-4.9/002-add_powertables.patch

target/linux/mvebu/patches-4.9/003-add_switch_nodes.patch

target/linux/mvebu/patches-4.9/010-build_new_dtbs.patch

target/linux/mvebu/patches-4.9/100-find_active_root.patch

target/linux/mvebu/patches-4.9/102-revert_i2c_delay.patch

.../linux/mvebu/patches-4.9/103-remove-nand-driver-bug.patch

...u/patches-4.9/104-linksys_mamba_disable_keep_config.patch

.../mvebu/patches-4.9/106-enable-bm-on-linksys-devices.patch

...nux/mvebu/patches-4.9/110-pxa3xxx_revert_irq_thread.patch

...ux/mvebu/patches-4.9/120-net-mvneta-add-BQL-support.patch

.../patches-4.9/200-gpio_mvebu_add_limited_pwm_support.patch

...t_bindings_extend_mvebu_gpio_documentation_with_pwm.patch

...s-4.9/202-mvebu_xp_add_pwm_properties_to_dtsi_files.patch

...u/patches-4.9/203-arm_mvebu_enable_pwm_in_defconfig.patch

...04-mvebu_wrt1900ac_use_pwm-fan_rather_than_gpio-fan.patch

.../mvebu/patches-4.9/205-armada-385-rd-mtd-partitions.patch

...ebu/patches-4.9/206-ARM-mvebu-385-ap-Add-partitions.patch