HID: hid-multitouch: migrate 3M PCT touch screens to hid-multitouch

This patch merges the hid-3m-pct driver into hid-multitouch.
To keep devices working the same way they used to with hid-3m-pct,
we need to add two signal/noise ratios for width and height.
We also need to work on width/height to send proper
ABS_MT_ORIENTATION flag.

Importing 3M into hid-multitouch also solved the bug in which
devices handling width and height in their report descriptors
did not show ABS_MT_TOUCH_MAJOR and ABS_MT_TOUCH_MINOR.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@enac.fr>
Reviewed-by: Stéphane Chatty <chatty@enac.fr>
Reviewed-and-tested-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/Kconfig

@@ -55,12 +55,6 @@ source "drivers/hid/usbhid/Kconfig"
 menu "Special HID drivers"
 	depends on HID
 
-config HID_3M_PCT
-	tristate "3M PCT touchscreen"
-	depends on USB_HID
-	---help---
-	Support for 3M PCT touch screens.
-
 config HID_A4TECH
 	tristate "A4 tech mice" if EXPERT
 	depends on USB_HID
@@ -314,6 +308,7 @@ config HID_MULTITOUCH
 	  Generic support for HID multitouch panels.
 
 	  Say Y here if you have one of the following devices:
+	  - 3M PCT touch screens
 	  - Cando dual touch panel
 	  - Cypress TrueTouch panels
 	  - Hanvon dual touch panels