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

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

Change-Id: Ib0aadb04484c980a4a0be9a382faba66f9339cf8
Signed-off-by: Automerger Merge Worker <[email protected]>