linux-wandboard

MLK-12203-1 ARM: imx: adjust i.MX7D DDR retention mode for LPSR

Per design team's recommendation, for i.MX7D TO1.1
LPSR mode, as IOMUXC will lost power, so it needs to
use TO1.0's flow to avoid CKE toggle during retention,
but it has a limitation of POR reset fail during LPSR.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>