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.

Bug: 261705301
Signed-off-by: Qais Yousef <qyousef@google.com>
Change-Id: I4223b3984003369e8fc7b2f0eac03bbe68569d6c

powerhint.json

@@ -134,6 +134,16 @@
       "DefaultIndex": 0,
       "ResetOnInit": true
     },
+    {
+      "Name": "CPUDVFSHeadroom",
+      "Path": "/proc/vendor_sched/dvfs_headroom",
+      "Values": [
+        "1280",
+        "1100"
+      ],
+      "DefaultIndex": 0,
+      "ResetOnInit": true
+    },
     {
       "Name": "MIFTargetLoad",
       "Path": "/sys/class/devfreq/17000010.devfreq_mif/interactive/target_load",
@@ -1051,6 +1061,12 @@
       "Duration": 0,
       "Value": "1100"
     },
+    {
+      "PowerHint": "CAMERA_STREAMING_HIGH",
+      "Node": "CPUDVFSHeadroom",
+      "Duration": 0,
+      "Value": "1100"
+    },
     {
       "PowerHint": "CAMERA_STREAMING_HIGH",
       "Node": "CPUMidClusterMaxFreq",