Add TEST_MAPPING for displayservicetests

- Run display tests when either display code is changed or when display
  tests code are changed.

Bug: 290761553
Test: atest --test-mapping services/core/java/com/android/server/display:presubmit

Merged-In: I55bb88ea2ab656d5fbdd3a23fdc2a6371384aec9
Change-Id: I83a7bb3167dc186f638356e909bfdfe03ee30b54
2 files changed