[PATCH] USB: usbtouchscreen: unified USB touchscreen driver

A new single driver for various USB touchscreen devices. It currently
supports:
- eGalax TouchKit
- PanJit TouchSet
- 3M/Microtouch
- ITM Touchscreens

Support for the diffent devices can be enabled/disable when CONFIG_EMBEDDED
is set.

Sizes for comparision:
   text    data     bss     dec     hex filename
   2942     724       4    3670     e56 touchkitusb.ko
   2647     660       0    3307     ceb mtouchusb.ko
   2448     628       0    3076     c04 itmtouch.ko
   4145    1012      12    5169    1431 usbtouchscreen.ko

Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>