drivers: pm: imx: relocate power management code

Relocate power management functions from plat-imx/pm to
core/drivers/pm/imx

Signed-off-by: Clement Faure <clement.faure@nxp.com>
Acked-by: Jens Wikl

drivers: pm: imx: relocate power management code

Relocate power management functions from plat-imx/pm to
core/drivers/pm/imx

Signed-off-by: Clement Faure <clement.faure@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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