The Thinkpad P50 has 2 fans. Add the 2FAN quirk so the tpacpi driver
properly reports both fan speeds.
Because the P50 doesn't report the version of its EC controller,
we need to identify it by BIOS version (N1).
Signed-off-by: NAlexander Kappner <agk@godking.net>
Acked-by: NHenrique de Moraes Holschuh <hmh@hmh.eng.br>
[andy: renamed macro, massaged changelog]
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>