nuke ar7-2.4 (old code, dsl driver no longer compiles, replaced by ar7-2.6)

target/linux/ar7-2.4/Makefile

target/linux/ar7-2.4/base-files.mk

target/linux/ar7-2.4/base-files/default/etc/init.d/adam2

target/linux/ar7-2.4/base-files/default/etc/preinit.arch

target/linux/ar7-2.4/config/default

target/linux/ar7-2.4/image/Makefile

target/linux/ar7-2.4/image/sercomm/adam2.bin

target/linux/ar7-2.4/image/sercomm/dg834

target/linux/ar7-2.4/image/sercomm/jdr454wb

target/linux/ar7-2.4/image/src/LzmaDecode.c

target/linux/ar7-2.4/image/src/LzmaDecode.h

target/linux/ar7-2.4/image/src/gzip.h

target/linux/ar7-2.4/image/src/ld.script.in

target/linux/ar7-2.4/image/src/loader.c

target/linux/ar7-2.4/image/src/srec2bin.c

target/linux/ar7-2.4/image/src/zimage.script.in

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

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

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

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