ANDROID: GKI: drivers: thermal: Indicate in DT the trips are for temperature falling

SoCs may need to handle the case where the temperature is below the
timing closure temperatures of the logic. At low temperature, the timing
closures may not be met. The compensative action at such temperatures is
to increase the voltage, by switching to a higher OPP.

Thermal governors need to understand that the temperatures are
descending in order to correctly estimate the mitigative actions.

Change-Id: I56eb249a853d9c8ed9a96ff8a41a1ba87abb29f4
Bug: 149945768
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>
(cherry picked commit from 8a12149c264c7b871932ad90f76e5981452bb4bb)
Signed-off-by: Hridya Valsaraju <hridya@google.com>