Remove TEST_MAPPING on system/apex.

This file has the side effect of triggering tests from system/apex/apexd
whenever another test mapping file references system/apex/tests. The
reason for this is that test mapping for a given directory are
inherited implicitly from all the top directories.

Test: atest --test_mapping (with various combinations)
Change-Id: Id82e24326b28a794667f3fa9b4f67a2507014dfa
3 files changed
tree: 0aa8179c106c3baf065bb39c390add8d8ef2aa30
  1. apexd/
  2. apexer/
  3. proto/
  4. tests/
  5. OWNERS
  6. PREUPLOAD.cfg