brcm63xx: switch to linux 3.10

3.10 is stable enough, and 3.9 is EOL since a while.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37910 3c298f89-4303-0410-b956-a3cf2f4a3e73
brcm63xx: drop linux 3.9 support

It is EOL since quite a while, so no need to keep it around.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@37911 3c298f89-4303-0410-b956-a3cf2f4a3e73