The dvfs headroom was split into its own knob. Update to use it.

util_threshold only controls migration margin now. dvfs headroom has its
own new knob.

Test: Local run
Bug: 281792287
Change-Id: I5b98823b1afa7eccee65155d76c04f0d958a7317
Signed-off-by: paulsu <paulsu@google.com>

powerhint-akita.json

@@ -177,6 +177,16 @@
       "DefaultIndex": 0,
       "ResetOnInit": true
     },
+    {
+      "Name": "CPUDVFSHeadroom",
+      "Path": "/proc/vendor_sched/dvfs_headroom",
+      "Values": [
+        "1280",
+        "1100"
+      ],
+      "DefaultIndex": 0,
+      "ResetOnInit": true
+    },
     {
       "Name": "CAMUClampBoost",
       "Path": "/proc/vendor_sched/cam_uclamp_min",
@@ -1096,6 +1106,12 @@
       "Duration": 0,
       "Value": "1100"
     },
+    {
+      "PowerHint": "CAMERA_STREAMING_HIGH",
+      "Node": "CPUDVFSHeadroom",
+      "Duration": 0,
+      "Value": "1100"
+    },
     {
       "PowerHint": "CAMERA_STREAMING_HIGH",
       "Node": "CDPreferHighCap",