Input: usbtouchscreen - allow reporting calibrated data

This patch adds a module parameter to report either the raw
coordinate data or the hardware-calibrated coordinate data for
MicroTouch/3M touchscreens.  The default is set to the raw
coordinates for backwards compatibilty.

Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>