SF: Rename RefreshRateConfigs

"Configs" is vague and overloaded, and collections thereof cannot simply
pluralize the name. Also, update the stale class comment.

Bug: 241285191
Test: Build
Change-Id: I3b6d2259dcaa390f44c07caa07c05361c6cb428b
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index d2b5813..5daa398 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -111,7 +111,7 @@
         "SurfaceFlinger_UpdateLayerMetadataSnapshotTest.cpp",
         "SchedulerTest.cpp",
         "SetFrameRateTest.cpp",
-        "RefreshRateConfigsTest.cpp",
+        "RefreshRateSelectorTest.cpp",
         "RefreshRateSelectionTest.cpp",
         "RefreshRateStatsTest.cpp",
         "RegionSamplingTest.cpp",