large target/linux cleanup

openwrt/target/linux/Config.in

openwrt/target/linux/Makefile

openwrt/target/linux/ar531x-2.4/Makefile

openwrt/target/linux/ar531x-2.4/config

...target/linux/ar531x-2.4/patches/000-atheros-support.patch

openwrt/target/linux/ar7-2.4/Makefile

openwrt/target/linux/ar7-2.4/config

openwrt/target/linux/ar7-2.4/patches/000-ar7_support.patch

openwrt/target/linux/ar7-2.4/patches/001-flash_map.patch

openwrt/target/linux/ar7-2.4/patches/002-led_driver.patch

...t/target/linux/ar7-2.4/patches/003-net_driver_cpmac.patch

openwrt/target/linux/ar7-2.4/patches/004-atm_driver.patch

openwrt/target/linux/ar7-2.4/patches/005-wdt_driver.patch

openwrt/target/linux/ar7-2.4/patches/006-sched_use_tsc.patch

openwrt/target/linux/brcm-2.4/Config.in

openwrt/target/linux/brcm-2.4/Makefile

openwrt/target/linux/brcm-2.4/config

openwrt/target/linux/brcm-2.4/patches/001-bcm47xx.patch

openwrt/target/linux/brcm-2.4/patches/002-wl_fix.patch

...rget/linux/brcm-2.4/patches/003-bcm47xx_cache_fixes.patch