imx: imx8qm: add system reset support

Add system reset support for i.MX8QM,
when Linux kernel issues "reboot" command,
TF-A will send command to inform system
controller to reset whole board according
to board design, tested on i.MX8QM MEK board.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>

plat/imx/imx8qm/imx8qm_psci.c

@@ -95,6 +95,7 @@ static const plat_psci_ops_t imx_plat_psci_ops = {
 	.pwr_domain_on_finish = imx_pwr_domain_on_finish,
 	.validate_ns_entrypoint = imx_validate_ns_entrypoint,
 	.system_off = imx_system_off,
+	.system_reset = imx_system_reset,
 };
 
 int plat_setup_psci_ops(uintptr_t sec_entrypoint,