drivers: thermal: Add trace event for hysteresis clear

Add new trace event to display information related to hysteresis clear.
Also update the cdev trace to print the aggregated floor request for a
cooling device.

Update the step_wise and low limits governor to call the hysteresis
trace when the hysteresis temperature is cleared.

Change-Id: I265f90c247f4bab65abeece68175bfc8853d459d
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>