Add the initial xRDC support on i.MX8ULP. Signed-off-by: Ye Li <ye.li@nxp.com> Signed-off-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Jacky Bai <ping.bai@nxp.com> Change-Id: I93ea8e2cebb049e6f20e71cfe50c7583a3228f38