Input: elan_i2c - add id for touchpad found in Lenovo s21e-20

Lenovo s21e-20 uses ELAN0601 in its ACPI tables for the Elan touchpad.
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/mouse/elan_i2c_core.c

@@ -1337,6 +1337,7 @@ static const struct acpi_device_id elan_acpi_id[] = {
 	{ "ELAN0000", 0 },
 	{ "ELAN0100", 0 },
 	{ "ELAN0600", 0 },
+	{ "ELAN0601", 0 },
 	{ "ELAN0602", 0 },
 	{ "ELAN0605", 0 },
 	{ "ELAN0608", 0 },