HID: multitouch: add support of EliteGroup 05D8 panels

They need to have the class SERIAL.

Note: it is a Win 7 panel, not Win 8 certified.

Signed-off-by: Tomas Sokorai <tsokorai@gmail.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>