package/kernel: xt_NOTRACK has been removed in 3.7-rc1

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@35475 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: update linux 3.7 to 3.7.6

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@35476 3c298f89-4303-0410-b956-a3cf2f4a3e73