Add functions to check if M33 image is booted and handshake with M33 image via MU. A core notifies M33 to start init by FCR F0, then wait M33 init done signal by checking FSR F0. Reviewed-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Ye Li <ye.li@nxp.com> Signed-off-by: Biwen Li <biwen.li@nxp.com> Signed-off-by: Peng Fan <peng.fan@nxp.com>