remove 2.6.25 support

Config.in

include/image.mk

package/acx-mac80211/Makefile

package/kernel/modules/block.mk

package/mac80211/Makefile

target/linux/generic/config-2.6.25

target/linux/generic/files-2.6.25/drivers/char/gpio_dev.c

...ux/generic/files-2.6.25/drivers/input/misc/gpio_buttons.c

...ux/generic/files-2.6.25/drivers/leds/ledtrig-default-on.c

...t/linux/generic/files-2.6.25/drivers/leds/ledtrig-morse.c

.../linux/generic/files-2.6.25/drivers/leds/ledtrig-netdev.c

target/linux/generic/patches-2.6.25/001-squashfs.patch

...et/linux/generic/patches-2.6.25/002-lzma_decompress.patch

target/linux/generic/patches-2.6.25/003-squashfs_lzma.patch

...linux/generic/patches-2.6.25/004-extra_optimization.patch

target/linux/generic/patches-2.6.25/005-squashfs_fix.patch

...et/linux/generic/patches-2.6.25/006-gcc4_inline_fix.patch

target/linux/generic/patches-2.6.25/007-samsung_flash.patch

...eric/patches-2.6.25/009-revert_intel_flash_breakage.patch

...tches-2.6.25/010-disable_old_squashfs_compatibility.patch