HID: Driver for Lenovo Keyboard with Trackpoint

This driver for the "Lenovo ThinkPad USB Keyboard with Trackpoint" supports
setting various device attributes, controlling mute and microphone mute
LEDs and enables use of the microphone mute key.

Signed-off-by: Bernhard Seibold <mail@bernhard-seibold.de>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>