Merge "Add sysprop for refresh rate threshold." into sc-dev am: c14d1a9f am: f52e19e9 am: 5e1a06f3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/15084528

Change-Id: I0afa866aec24727b100c705c4cbdac4b07430845