MU is shared between rpmsg driver and the multi-core power management on i.MX6SX and i.MX7D, the RIE3 is enabled by MU driver, but when rpmsg is probed, it will call MU_Init and RIE3 will be clear and cause multi-core power management never work, so do NOT clear RIEn during MU initialization for i.MX6SX and i.MX7D. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Reviewed-by: Peng Fan <peng.fan@nxp.com>