Properly report CPU temperature on AMD systems

[Athemis]

Sensors output of CPU temperature for current AMD processors is currently not parsed correctly since it is not matched by the used regex expression:

k10temp-pci-00c3
Adapter: PCI adapter
Tctl:         +42.0°C  
Tccd1:        +37.0°C  

This pull request adds "Tctl" to the regex and corresponding processing function.

[tobias-kuendig]

Thank you!