Adding support for the Microsoft Surface 3 (non-pro) Type Cover.

The existing definitions and quirks are actually for the Surface
Pro 3 type covers. I've renamed the old constants to reflect that
they belong to the Surface Pro 3, and added a new constant and
matching code for the Surface 3.
Signed-off-by: Stephen Just <stephenjust@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>