drivers: imx_scu: move imx_scu driver source file

Move imx_scu driver from plat-imx/ to core/drivers/
Rename CFG_SCU to CFG_IMX_SCU compilation flag.

Signed-off-by: Clement Faure <clement.faure@nxp

drivers: imx_scu: move imx_scu driver source file

Move imx_scu driver from plat-imx/ to core/drivers/
Rename CFG_SCU to CFG_IMX_SCU compilation flag.

Signed-off-by: Clement Faure <clement.faure@nxp.com>
Reviewed-by: Jerome Forissier <jerome.forissier@linaro.org>

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