These patches add support for ipq806x NAND flash controller. Most of
these are cherry-picked & backported from LKML:
*https://lkml.org/lkml/2015/8/3/16



This patch just modifies the kernel code, but doesn't change the config.
It should be harmless.

Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46568 3c298f89-4303-0410-b956-a3cf2f4a3e73