ACPI / video: Add 4 new models to the use_native_backlight DMI list

Acer Aspire V5-171
References: https://bugzilla.redhat.com/show_bug.cgi?id=983342



Acer Aspire V5-471G
Lenovo Yoga 2 11
Reported-and-tested-by: Vincent Gerris <vgerris@gmail.com>

HP EliteBook 8470p
References: https://bugzilla.redhat.com/show_bug.cgi?id=1093120



Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>