HID: asus: Add support for multi-touch touchpad on Medion Akoya E1239T

[ Upstream commit e271f6c2 ]

The multi-touch touchpad found on the Medion Akoya E1239T's keyboard-dock,
uses the same custom multi-touch protocol as the Asus keyboard-docks
(same chipset vendor, Integrated Technology Express / ITE).

Add support for this using the existing multi-touch touchpad support in
the hid-asus driver.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Stable-dep-of: 4ab3a086 ("HID: asus: use spinlock to safely schedule workers")
Signed-off-by: Sasha Levin <sashal@kernel.org>