pixelstats: Add a listener for Thermal Abnormal uevents

Thermal Metrics will send uevents with THERMAL_ABNORMAL_TYPE and
THERMAL_ABNORMAL_INFO whenever an abnormality is deteceted.
Report these from pixelstats.

Bug: 238326225
Test: Verify statsD logs and uevent logs
Change-Id: Ie21ee3da55faff1f68cf4bb8b8af53d3fb6aba90
2 files changed