ARM: imx: mem bit must be cleared before entering DSM mode

According to hardware design, mem bit must be clear before
entering DSM mode, as ARM core will be power gated in DSM mode.

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

diff --cc arch/arm/mach-imx/common.h
Simple merge

diff --cc arch/arm/mach-imx/cpuidle-imx6q.c
Simple merge

diff --cc arch/arm/mach-imx/pm-imx6.c
Simple merge