Support skipping layer dump on virtual displays

Virtual displays consume significant buffer space and
frequently fill the in memory ring buffer during the transition, causing
test flakiness. To mitigate this problem, do'nt dump traces from virtual
displays by default

Bug: 255715397
Test: atest FlickerLibTest
Change-Id: I4a5d8a1fac52899f126edccf6534bed4876b10e0