set default kernel to 3.14.12
ar71xx: copy 3.10 related files to 3.14
ar71xx: remove unneeded patches

Already applied in upstream.
ar71xx: remove patch 424-net-phy-add-phy_mmd_read_write-functions.patch

Function phy_{read,write}_mmd defined but not used in this patch
series. Besides, upstream has defined a funcion the same name. Remove
this patch to avoid double defination.
ar71xx: refresh 206-spi-ath79-make-chipselect-logic-more-flexible.patch
ar71xx: refresh 406-mtd-m25p80-allow-to-specify-max-read-size.patch
ar71xx: refresh 409-mtd-rb4xx_nand_driver.patch
ar71xx: refresh patches-3.14/410-mtd-rb750-nand-driver.patch
ar71xx: refresh 414-mtd-rb91x-nand-driver.patch
ar71xx: refresh 425-net-phy-at803x-allow-to-configure-via-pdata.patch
ar71xx: refresh 431-spi-add-various-flags.patch
ar71xx: refresh 450-gpio-nxp-74hc153-gpio-chip-driver.patch
ar71xx: refresh 451-gpio-74x164-improve-platform-device-support.patch
ar71xx: refresh 452-gpio-add-gpio-latch-driver.patch
ar71xx: refresh 462-mtd-m25p80-set-spi-transfer-type.patch
ar71xx: refresh 463-spi-ath79-add-fast-flash-read.patch
ar71xx: refresh 490-usb-ehci-add-quirks-for-qca-socs.patch
ar71xx: refresh 609-MIPS-ath79-ap136-fixes.patch
ar71xx: refresh 902-unaligned_access_hacks.patch
ar71xx: update config