Input: wm97xx-core - report a phys for WM97xx touchscreens
phys is displayed in diagnostic output like that from evbug so ensure
that it is set to something.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
authored by Mark Brown and committed by Dmitry Torokhov 6b32ca39 d35895db