HID: multitouch: Add egalax ID for Acer Iconia W500

commit bb9ff21072043634f147c05ac65dbf8185d4af6d upstream.

This patch adds USB ID for the touchpanel in Acer Iconia W500. The panel
supports up to five fingers, therefore the need for a new addition of panel
types.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>