hwmon: (dell-smm) Add Dell XPS 15 9560 into DMI list

It was reported that dell-smm-hwmon is working fine on Dell XPS 15 9560.

Link: http://www.spinics.net/lists/platform-driver-x86/msg10751.html


Reported-by: Vasile Dumitrescu <vasile.dumitrescu@undeva.eu>
Signed-off-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>