Fix threshold parsing logic of CPU sensors

This commit fixes threshold parsing logic of CPU sensors to make
a sensor can be registered even in case there is no threshold
setting.

Change-Id: I95641fb37472b65e8bf70925605b41c66bdad60f
Signed-off-by: Yoo, Jae Hyun <jae.hyun.yoo@intel.com>
3 files changed