Test display associations in TouchIntegrationTest

Added test for display linked via a input-port and via a unique id

Bug: 285478143
Test: atest inputflinger_tests

Change-Id: I12fb815eec20b345545899a20dc28110bfd321f0
Merged-In: I12fb815eec20b345545899a20dc28110bfd321f0
3 files changed