Add maxTargetSdk restriction to unused APIs.

These are APIs that have @UnsupportedAppUsage but for which we don't
have any evidence of them currently being used, so should be safe to
remove from the unsupported list.

Bug: 170729553
Test: Treehugger
Merged-In: I626caf7c1fe46c5ab1f39c2895b42a34319f771a
Change-Id: I54e5ecd11e76ca1de3c5893e3a98b0108e735413

location/java/android/location/IGeofenceProvider.aidl

@@ -24,6 +24,6 @@ import android.hardware.location.IGeofenceHardware;
  * {@hide}
  */
 oneway interface IGeofenceProvider {
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = 30, trackingBug = 170729553)
     void setGeofenceHardware(in IGeofenceHardware proxy);
 }

location/java/android/location/Location.java

@@ -127,7 +127,7 @@ public class Location implements Parcelable {
     @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
     private String mProvider;
     private long mTime = 0;
-    @UnsupportedAppUsage
+    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)
     private long mElapsedRealtimeNanos = 0;
     // Estimate of the relative precision of the alignment of this SystemClock
     // timestamp, with the reported measurements in nanoseconds (68% confidence).