ar71xx: sync kernel sizes where possible to fix images for some devices (#12874)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35309 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: remove the cisco sip phone patch for 3.7 and 3.8 as well

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@35310 3c298f89-4303-0410-b956-a3cf2f4a3e73