Improve handling of hwcomposer with unsupported present fences

An implementation such as HWC2OnFbAdapter always returns -1 for the
present fence. FrameTimeline should not ignore invalid fences in
mPendingPresentFences, since in this case every fence is invalid,
resulting in resource leaks. Similarly, PresentLatencyTracker should not
be used if HWC doesn't support present fences.

Test: no logspam running on starnix (fuchsia), which uses framebuffer
Test: booted emulator, no behavior change
Test: booted panther, no behavior change
Change-Id: I4a11edc443a1cd3a395fc8f97b93a5474d11fe31