identify sysfs entries. Reasons for this rewrite / bugs fixed:
-Don't give features like alarms / sensor type / fault flag a
compute mapping only a normal mapping
-Don't generate features for sysfs entries like uvent, modalias, etc.
instead only generate features for features known by
sensors_feature_get_type()
-Sort the list of found features logically instead of sorted in alphabet order
of the sysfs entry. So now it starts with all in entries, then all fan and
then all temp. Just like the order of most entries in lib/chips.c. Also
this means that it now contains in0 - in10 in that order and not in0, in10,
in1 - in9