ppc40x: switch to 3.8

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

git-svn-id: svn://svn.openwrt.org/openwrt@35881 3c298f89-4303-0410-b956-a3cf2f4a3e73
ppc40x: remove 3.7 support

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

git-svn-id: svn://svn.openwrt.org/openwrt@35882 3c298f89-4303-0410-b956-a3cf2f4a3e73
ppc44x: switch to 3.8

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

git-svn-id: svn://svn.openwrt.org/openwrt@35883 3c298f89-4303-0410-b956-a3cf2f4a3e73
ppc44x: remove 3.7 support

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

git-svn-id: svn://svn.openwrt.org/openwrt@35884 3c298f89-4303-0410-b956-a3cf2f4a3e73