imx6: add support for 3.14

Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40753 3c298f89-4303-0410-b956-a3cf2f4a3e73
imx6: drop support for 3.13

Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40754 3c298f89-4303-0410-b956-a3cf2f4a3e73
imx6: delete empty directory

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40755 3c298f89-4303-0410-b956-a3cf2f4a3e73