Revert "thermal: start PID throttling according to the current throttling step"

This reverts commit 5f290576c1aede0ecc182ebd06c15a80df2e376f.

Reason for revert: <cdev will not be released until reach NONE>

Bug: 324076798
Test: confirm the cdev behavior for non ODPM throttling policy with emul_temp

Change-Id: I681e6d6f1ee892f517587c02be4eb727c9aca9d4