msi-laptop: add MSI U270 netbook to module alias and scm list

After test, msi-laptop driver also can support MSI U270 netbook.
So, add MSI U270's dmi information to module alias and scm table
for support this machine.

Tested on MSI U270 netbook.

Cc: Matthew Garrett <mjg@redhat.com>
Cc: Dmitry Torokhov <dtor@mail.ru>
Cc: Corentin Chary <corentincj@iksaif.net>
Cc: Thomas Renninger <trenn@suse.de>
Signed-off-by: Lee, Chun-Yi <jlee@novell.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>