Input: ALPS - add signature for HP Pavilion dm3 laptops

Tested by a user running Ubuntu 9.10 in the following bug report.

BugLink: http://bugs.launchpad.net/bugs/545307



Signed-off-by: Chase Douglas <chase.douglas@canonical.com>
Cc: stable@kernel.org
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>