The dvfs headroom was split into its own knob. Update to use it. am: d57beb455c am: 690db828aa am: fdf070759e

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

Change-Id: Ifadfe5b6cbec6303b5ea76eff48e33fe7df04f76
Signed-off-by: Automerger Merge Worker <[email protected]>