The dvfs headroom was split into its own knob. Update to use it. am: d57beb455c am: 690db828aa am: f45a33bea1 am: e1792bd356

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

Change-Id: I398d778e1d0caaa748200a3f41e42fd207fd5b1c
Signed-off-by: Automerger Merge Worker <[email protected]>