Rename SurfaceControl.DisplayMode#refreshRate to peakRefreshRate

Peak refresh rate is a more clear name to use internally.

Also while we're here, plumb vsyncRate into LocalDisplayAdapter so that
DisplayManager can start using the concept.

Bug: 301462354
Test: builds
Test: dumpsys display
Change-Id: I4889e2bb2cd82c910c97e1f7ba14327e95b02ab1