ar71xx: remove unused kernel versions, 2.6.36 should be the next target

target/linux/ar71xx/config-2.6.33

target/linux/ar71xx/config-2.6.34

target/linux/ar71xx/config-2.6.35

target/linux/ar71xx/patches-2.6.33/001-ar71xx_core.patch

target/linux/ar71xx/patches-2.6.33/002-ar71xx_pci.patch

target/linux/ar71xx/patches-2.6.33/003-ar71xx_usb_host.patch

...nux/ar71xx/patches-2.6.33/004-ar71xx_spi_controller.patch

...t/linux/ar71xx/patches-2.6.33/005-ar71xx_mac_driver.patch

...t/linux/ar71xx/patches-2.6.33/006-ar71xx_wdt_driver.patch

...linux/ar71xx/patches-2.6.33/007-ar91xx_flash_driver.patch

.../linux/ar71xx/patches-2.6.33/101-ksz8041_phy_driver.patch

...x/patches-2.6.33/102-mtd_m25p80_add_myloader_parser.patch

...xx/patches-2.6.33/104-mtd_m25p80_add_redboot_parser.patch

.../ar71xx/patches-2.6.33/107-mtd-SST39VF6401B-support.patch

...hes-2.6.33/108-mtd_fix_cfi_cmdset_0002_status_check.patch

...x/ar71xx/patches-2.6.33/109-mtd-wrt160nl-trx-parser.patch

...hes-2.6.33/110-usb-ehci-add-war-for-synopsys-hc-bug.patch

...hes-2.6.33/111-mtd-cfi_cmdset_0002-force-word-write.patch

...x/patches-2.6.33/120-dsa-trailer-tag-validation-fix.patch

...ux/ar71xx/patches-2.6.33/121-dsa-add-88e6063-driver.patch