firmware: arm_scmi: Convert to SYSTEM_SLEEP_PM_OPS

The old SET_SYSTEM_SLEEP_PM_OPS() macro leads to a warning about an
unused function:

| drivers/firmware/arm_scmi/scmi_power_control.c:363:12: error:
| 'scmi_system_power_resume' defined but not used [-Werror=unused-function]
| static int scmi_system_power_resume(struct device *dev)

The proper way to do this these days is to use SYSTEM_SLEEP_PM_OPS()
and pm_sleep_ptr().

Fixes: 9a0658d3991e ("firmware: arm_scmi: power_control: Ensure SCMI_SYSPOWER_IDLE is set early during resume")
Signed-off-by: Arnd Bergmann <[e-mail]>
Acked-by: Peng Fan <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Sudeep Holla <[e-mail]>

drivers/firmware/arm_scmi/scmi_power_control.c

···
 }
 
 static const struct dev_pm_ops scmi_system_power_pmops = {
-	SET_SYSTEM_SLEEP_PM_OPS(NULL, scmi_system_power_resume)
+	SYSTEM_SLEEP_PM_OPS(NULL, scmi_system_power_resume)
 };
 
 static const struct scmi_device_id scmi_id_table[] = {
···
 
 static struct scmi_driver scmi_system_power_driver = {
 	.driver	= {
-		.pm = &scmi_system_power_pmops,
+		.pm = pm_sleep_ptr(&scmi_system_power_pmops),
 	},
 	.name = "scmi-system-power",
 	.probe = scmi_syspower_probe,