mfd: rk8xx: Add support for standard system-power-controller property

DT property rockchip,system-power-controller is now deprecated.
Signed-off-by: Ondrej Jirman <megi@xff.cz>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20231019165732.3818789-4-megi@xff.czSigned-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/rk8xx-core.c

@@ -685,7 +685,8 @@ int rk8xx_probe(struct device *dev, int variant, unsigned int irq, struct regmap
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to add MFD devices\n");
 
-	if (device_property_read_bool(dev, "rockchip,system-power-controller")) {
+	if (device_property_read_bool(dev, "rockchip,system-power-controller") ||
+	    device_property_read_bool(dev, "system-power-controller")) {
 		ret = devm_register_sys_off_handler(dev,
 				    SYS_OFF_MODE_POWER_OFF_PREPARE, SYS_OFF_PRIO_HIGH,
 				    &rk808_power_off, rk808);