wspoon: Unhardcode cooling type gpio keys device

Use the udev created symlink given the forthcoming introduction
of additional input devices (gpio-keys-polled) and the non-deterministic
probe order that comes along with that.

Change-Id: I0f0ffa96adb958be0c1835ccb1a1e73d5378de03
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
1 file changed