imx6: drop upstream rejected patch

http://article.gmane.org/gmane.linux.drivers.i2c/17891

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39639 3c298f89-4303-0410-b956-a3cf2f4a3e73