imx6: update upstream patch

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42081 3c298f89-4303-0410-b956-a3cf2f4a3e73