mvebu: update to 3.8-rc3

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@35086 3c298f89-4303-0410-b956-a3cf2f4a3e73
netfilter: xt_NOTRACK is incorporated in xt_CT as of 3.8-rc3

Signed-off-by: Florian Fainelli <florian@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@35087 3c298f89-4303-0410-b956-a3cf2f4a3e73
uClibc: backport useful fixes from trunk (#12777)

git-svn-id: svn://svn.openwrt.org/openwrt@35088 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath9k: add updated tx gain tables, fixes stability issues on TL-WDR4300 and other devices

git-svn-id: svn://svn.openwrt.org/openwrt@35089 3c298f89-4303-0410-b956-a3cf2f4a3e73
ath9k: add updated tx gain tables, fixes stability issues on TL-WDR4300 and other devices

Backport of r35089

git-svn-id: svn://svn.openwrt.org/openwrt@35090 3c298f89-4303-0410-b956-a3cf2f4a3e73