thermal: Reduce DVFS throttling per BCL irq

By increasing hardware clock divider count, we do not need to throttle
as hard to mitigate for brownout.

Bug: 221070649
Test: Local stress test to ensure no brownout.
Signed-off-by: George Lee <geolee@google.com>
Change-Id: I7ced6cdcf215738dd50d527f9f58ae4046492b29