SF: Remove DisplayDevice::onVsync

The DisplayDevice does not exist until the display transaction created
by the `configure` stage is committed. HWComposer::DisplayData already
stores the present timestamp, so query that and remove DisplayDevice's
duplicate.

Bug: 248345991
Bug: 241285876
Test: Hotplug
Change-Id: I6b0cbe2e36d2d4ec0e2a1a1197b60e0c9ae60bfe