hwmon: (thmc50) add individual alarm & fault files

This patch adds individual alarm and fault files to
the thmc50 driver. These sysfs entries are required
for a new libsensors library.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>