camera power hint: raise CPU clock more conservatively at STREAM_HIGH mode

During streaming high fps mode, the BW is high and lead to CPU memory
high latency. This hint tries to avoid raising the CPU clock
at the condition when CPU is waiting for data access.

Bug: 184583714
Test:
4k60: 59+fps
1080p60fps: 58fps (b/186806120, disable eis can get 60fps)
Power benefit 80-100mW

Signed-off-by: Peter Liu <pingchienliu@google.com>
Change-Id: I3849dfd170085f7e10b5c53d27af353026a4093a

powerhint.json

@@ -83,6 +83,16 @@
       ],
       "ResetOnInit": true
     },
+    {
+      "Name": "CPUUtilThreshold",
+      "Path": "/sys/kernel/vendor_sched/util_threshold",
+      "Values": [
+        "1280",
+        "1100"
+      ],
+      "DefaultIndex": 0,
+      "ResetOnInit": true
+    },
     {
       "Name": "MIFTargetLoad",
       "Path": "/sys/class/devfreq/17000010.devfreq_mif/interactive/target_load",
@@ -337,6 +347,12 @@
       "Duration": 1000,
       "Value": "9999999"
     },
+    {
+      "PowerHint": "CAMERA_STREAMING_HIGH",
+      "Node": "CPUUtilThreshold",
+      "Duration": 0,
+      "Value": "1100"
+    },
     {
       "PowerHint": "CAMERA_STREAMING_HIGH",
       "Node": "CPUBigClusterMaxFreq",