Add Wexler TAB 7200 tablet

Signed-off-by: Aleksei Mamlin <mamlinav@gmail.com>
Add HCore HC860

Signed-off-by: Luc Verhaegen <libv@skynet.be>
Add MK808C

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>