Mark deleteMessageFromIcc() as @UnsupportedAppUsage.

The API was exposed in ag/9766884 but reverted in ag/10665971. However
with the revert the annotation was not added back.

Test: TH
Bug: 159022482
Change-Id: Ia7d200bfd4d4565971701048b1c469a6633edeb4

telephony/java/android/telephony/SmsManager.java

@@ -1718,6 +1718,7 @@ public final class SmsManager {
      *
      * {@hide}
      */
+    @UnsupportedAppUsage
     @RequiresPermission(Manifest.permission.ACCESS_MESSAGES_ON_ICC)
     public boolean deleteMessageFromIcc(int messageIndex) {
         boolean success = false;