Merge "WM: add missing plumbing for preferredMaxDisplayRefreshRate" into sc-dev am: 8dff5292 am: d9ed5989 am: cee764c6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15133561

Change-Id: Ib3d2ac9739ba4e07e70dfc4824a3f36af1690071