Revert "Break down jank between frame drops vs. triple buffered"

This reverts commit 09979fbe.

Reason for revert: Based on stacktraces and change history, I think this is causing a cluster of P crashes.
https://b.corp.google.com/issues?q=(%22android%22%20%22:uirenderer::JankTracker::finishFrame%22)
Bug: 75566601
Bug: 75811585
Bug: 75407175
Bug: 75736222
Bug: 75391447
Bug: 75659839

Change-Id: I59a8c2d8906d347210c77fb3628f5801bc299bfb