Input: atmel_mxt_ts - add mXT224 identifier to id_table

"mXT224" is used in the Intel mid firmware in SFI tables to identify the
presence of this I2C device.
Signed-off-by: Chris Leech <christopher.leech@linux.intel.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

drivers/input/touchscreen/atmel_mxt_ts.c

@@ -1371,6 +1371,7 @@ static const struct dev_pm_ops mxt_pm_ops = {
 static const struct i2c_device_id mxt_id[] = {
 	{ "qt602240_ts", 0 },
 	{ "atmel_mxt_ts", 0 },
+	{ "mXT224", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, mxt_id);