drivers: ifc: restore the legacy flow for IFC config

Restore the legacy flow along with TFABOOT flow for
IFC configuration.

Signed-off-by: Pankit Garg <pankit.garg@nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>