Cleanup config_mobile_hotspot_provision_app usage

config_mobile_hotspot_provision_app would be move out of framework and
only private for tethering only.
enforceTetherChangePermission is no longer needed because its only
caller PanService already gate by other privileged permission
(BLUETOOTH_PRIVILEGED).

Bug: 146918263
Test: m

Change-Id: I030871c2bc46bc09c4e52970b4995f98d31bb90e

core/java/android/net/ConnectivityManager.java

@@ -2271,27 +2271,6 @@ public class ConnectivityManager {
                 throwException);
     }
 
-    /** {@hide} */
-    public static final void enforceTetherChangePermission(Context context, String callingPkg,
-            String callingAttributionTag) {
-        Preconditions.checkNotNull(context, "Context cannot be null");
-        Preconditions.checkNotNull(callingPkg, "callingPkg cannot be null");
-
-        if (context.getResources().getStringArray(
-                com.android.internal.R.array.config_mobile_hotspot_provision_app).length == 2) {
-            // Have a provisioning app - must only let system apps (which check this app)
-            // turn on tethering
-            context.enforceCallingOrSelfPermission(
-                    android.Manifest.permission.TETHER_PRIVILEGED, "ConnectivityService");
-        } else {
-            int uid = Binder.getCallingUid();
-            // If callingPkg's uid is not same as Binder.getCallingUid(),
-            // AppOpsService throws SecurityException.
-            checkAndNoteWriteSettingsOperation(context, uid, callingPkg,
-                    callingAttributionTag, true /* throwException */);
-        }
-    }
-
     /**
      * Check if the package is a allowed to write settings. This also accounts that such an access
      * happened.