HID: multitouch: Support HID_GD_WIRELESS_RADIO_CTLS

Some keyboard + touchpad devices have the Microsoft Win8 Wireless Radio
Controls extensions Usage Page define in the touchpad report descriptor,
so we need to support them in this driver.

Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>