Revert "SurfaceFlinger: refresh rate calculation when no timestamps" am: b28c5cc186 am: bec285a0d3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/11464030

Change-Id: Iff1da78c809459e1e8968e8caa9ea6d86aeb878c