kernel: fix imx sata module

The imx sata module has only been backported to imx6 target. This change will
fix buildbot errors due to missing patches in other targets. Keep this until
all targets use kernel version with imx sata support in them.

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37950 3c298f89-4303-0410-b956-a3cf2f4a3e73