Skip updating the samples history on temperature change

The max headroom staleness of ignoring such adhoc temperature update is
within 1 second, so we don't need to seed the value but let the looper update samples by itself. This will prevent other problems caused by
race between callback update and looper update when two temperature
samples updated within a short window can result in high error variance
when calculating slope during linear regression, even if they have small
value difference. If needed we can revisit this if a temperature can
change drastically within a second on any device.

Bug: 408509573
Test: atest ThermalManagerServiceTest
Flag: EXEMPT bugfix
Change-Id: Ide671ae13b52d5b291e20aab52e9db41058d44c1