Input: wacom - add 0xE5 (MT device) support

Input: wacom - add 0xE5 (MT device) support

Main part of patch is adding support for a new Wacom MT touch
packet and labels these devices using MTSCREEN type.

Other items of interest:

Delete some duplicate code in HID parsing for Y info since
its already done in X path.

In wacom_query_tablet_data(), only invoke the set report
that requests tablets to send Wacom Touch packets for
Finger interfaces.  Mostly, this is to make code intent clear.

Tested-by: Jason Gerecke <[email protected]>
Signed-off-by: Chris Bagwell <[email protected]>
Signed-off-by: Ping Cheng <[email protected]>
Signed-off-by: Dmitry Torokhov <[email protected]>