FileMap::create: remove duplicate addition. am: 54794ac613 am: 2912d9c190 am: 98e213207f am: a6d7150812 am: 8a192ea12a

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/12393457

Change-Id: Iddc2342abba73f6a5bf15adf5ae2993a55cac444