arm: k3: Use driver_name to get ti_sci handle

Use the driver name to get ti_sci handle rather than relying
on just the FIRMWARE uclass.
Signed-off-by: NLokesh Vutla <lokeshvutla@ti.com>

arch/arm/mach-k3/common.c

@@ -22,7 +22,8 @@ struct ti_sci_handle *get_ti_sci_handle(void)
 	struct udevice *dev;
 	int ret;
 
-	ret = uclass_get_device(UCLASS_FIRMWARE, 0, &dev);
+	ret = uclass_get_device_by_driver(UCLASS_FIRMWARE,
+					  DM_GET_DRIVER(ti_sci), &dev);
 	if (ret)
 		panic("Failed to get SYSFW (%d)\n", ret);