Fix the problem that some items can't be searched in Privacy category.

The source of problem is that the controller returns the wrong
availability status value and the searchable attribut of the preference
is false.

Fix: 200249682
Test: manual test and see the search result
Change-Id: I2265514c49303f6a0910f1be84b281fccb9abb45

src/com/android/settings/privacy/CameraToggleController.java

@@ -40,7 +40,7 @@ public class CameraToggleController extends SensorToggleController {
     public int getAvailabilityStatus() {
         return mSensorPrivacyManagerHelper.supportsSensorToggle(getSensor())
                 && DeviceConfig.getBoolean(DeviceConfig.NAMESPACE_PRIVACY, "camera_toggle_enabled",
-                true) ? AVAILABLE_UNSEARCHABLE : UNSUPPORTED_ON_DEVICE;
+                true) ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
     }
 
     @Override

src/com/android/settings/privacy/MicToggleController.java

@@ -40,7 +40,7 @@ public class MicToggleController extends SensorToggleController {
     public int getAvailabilityStatus() {
         return mSensorPrivacyManagerHelper.supportsSensorToggle(getSensor())
                 && DeviceConfig.getBoolean(DeviceConfig.NAMESPACE_PRIVACY, "mic_toggle_enabled",
-                true) ? AVAILABLE_UNSEARCHABLE : UNSUPPORTED_ON_DEVICE;
+                true) ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
     }
 
     @Override

src/com/android/settings/privacy/WorkPolicyInfoPreferenceController.java

@@ -37,9 +37,7 @@ public class WorkPolicyInfoPreferenceController extends BasePreferenceController
 
     @Override
     public int getAvailabilityStatus() {
-        return mEnterpriseProvider.hasWorkPolicyInfo()
-                ? AVAILABLE_UNSEARCHABLE
-                : UNSUPPORTED_ON_DEVICE;
+        return mEnterpriseProvider.hasWorkPolicyInfo() ? AVAILABLE : UNSUPPORTED_ON_DEVICE;
     }
 
     @Override