Rename .map.txt used by tests

The suffix ".map.txt" triggers NDK-API-Review.
example.map.txt has been replaced with map.txt in the same directory.

Test: ANDROID_BUILD_TOP=`realpath .` \
      PATH=$PATH:`realpath out/soong/dist/bin` \
      development/vndk/tools/header-checker/tests/test.py
Bug: 298626434
Change-Id: Ie2e21fe87e5bfce7f081fe32eb55547d8aa611ad
4 files changed