The dvfs headroom was split into its own knob. Update to use it. am: d57beb455c am: fd9b900f05 am: f3c7e39989 am: 3c19129ea4

Original change: https://googleplex-android-review.googlesource.com/c/device/google/lynx/+/23121945

Change-Id: Ic189a7437b0659bb780b2cb4547ef1d3e500fe60
Signed-off-by: Automerger Merge Worker <[email protected]>