uboot-imx

MLK-12693-2 nand: mxs: correct bitflip for erased NAND page

This patch is a porting of
http://git.freescale.com/git/cgit.cgi/imx/linux-2.6-imx.git/commit/?h=imx_4.1.15_1.0.0_ga&id=e4dacc44d22e9474ec456cb330df525cd805ea38
"
i.MX6QP and i.MX7D BCH module integrated a new feature to detect the
bitflip number for erased NAND page. So for these two platform, set the
erase threshold to gf/2 and if bitflip detected, GPMI driver will
correct the data to all 0xFF.

Also updated the imx6qp dts file to ditinguish the GPMI module for i.MX6Q
with the one for i.MX6QP.
"

In this patch, i.MX6UL is added and threshold changed to use ecc_strength.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit 489929be0221bb7d4c46bb5bc6083650b78f73e0)
Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 37d7f9614aa357f270312d7ceaab0f7006dc5aea)
(cherry picked from commit 5f50a850dd42d28b6105ee7e1b4b1822e7ba569b)