Undeprecate LayoutParams.preferredRefreshRate

This was previously deprecated in favor of preferredDisplayModeId.
However, display modes include specific resolutions
so we would still need an API for the valid use-case
of specifying only a preferred refresh rate.

Bug: 227627158
Bug: 224915081
Test: built locally
Change-Id: Ic7c711d03d3ccc7a5193b26ca38159f048777927