Fix CtsSurfaceControlTestsStaging for 90Hz devices

Because real devices may have non-test layers that affect the outcome of
the actual refresh/render rate, the test should check for a valid frame
rate within a collection instead.

Bug: 316001789
Test: atest CtsSurfaceControlTestsStaging
Change-Id: Id9065308674c090724ef7fbb343f9d8f42c4f489