applesmc: Use standard sysfs names for labels

We have a standard suffix to associate a designation string to a sensor:
_label.  Use it instead of _position so that libsensors will catch it.
(This isn't implemented yet, but should be soon.)

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Nicolas Boichat <nicolas@boichat.ch>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>