ARM: imx: enable anatop suspend/resume

Anatop module have sereval configurations for user
to reduce the power consumption in suspend, provide
suspend/resume interface for further use and enable
fet_odrive to reduce CORE LDO leakage during suspend.

As we have a common anatop file, remove all the operations
of anatop module in other files, use anatop interfaces to
do that.

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