ARM: imx: add suspend/resume with FastMix OFF support

commit c93c701d9f27fbdf2333c4c37a1931898e94a8b9 from
https://source.codeaurora.org/external/imx/linux-imx

This patch adds suspend/resume with FastMix OFF support.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
[ Aisheng: fix conflict due to below commit
4a4fb661 ("ARM: imx: Add missing of_node_put()")
512a928a

 ("ARM: imx: build v7_cpu_resume() unconditionally") ]
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>