Make createLocationInfoSanitizedCopy as @hide.

As we are not shipping Telephony mainline and it's TBD whether
TelephonyRegistry will be part of mainline or not, we change
createLocationInfoSanitizedCopy from @SystemApi back to @hide.

Bug: 148179832
Test: build
Change-Id: I65dea196ab80aec96b6b35edcc0059cefc2f1b43

api/system-current.txt

@@ -11453,7 +11453,6 @@ package android.telephony {
   }
 
   public class ServiceState implements android.os.Parcelable {
-    method @NonNull public android.telephony.ServiceState createLocationInfoSanitizedCopy(boolean);
     method public void fillInNotifierBundle(@NonNull android.os.Bundle);
     method public int getDataNetworkType();
     method public int getDataRegistrationState();

telephony/java/android/telephony/ServiceState.java

@@ -1992,7 +1992,6 @@ public class ServiceState implements Parcelable {
      * @return the copied ServiceState with location info sanitized.
      * @hide
      */
-    @SystemApi
     @NonNull
     public ServiceState createLocationInfoSanitizedCopy(boolean removeCoarseLocation) {
         ServiceState state = new ServiceState(this);