The Elantech touchscreen/digitizer in the Surface Go mistakenly reports
having a battery. This results in a low battery message every time you
try to use the pen.

This patch adds a quirk to ignore the non-existent battery and
gets rid of the false low battery messages.
Signed-off-by: NZoltan Tamas Vajda <zoltan.tamas.vajda@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>