MLK-18343-2: plat: imx8mm: add support for RDC and CSU

move CSU and RDC driver to common/i.mx8m folder
and enable the driver for i.mx8mm

Signed-off-by: Silvano di Ninno <silvano.dininno@nxp.com>
Reviewed-by: Aymen Sghaier <aymen.sghaier@nxp.com>
(cherry picked from commit 7dd1b741efdc60ca6b5eaafc9d863744beb7064e)

Conflicts:
9 files changed