Cleanup dumpsys for refresh configs for non-90hz devices.

Also add tests exercising RefreshRateConfigs behavior.

Bug: 127846986
Test: libsurfaceflinger_unittest
Test: dumpsys SurfaceFlinger
Change-Id: Idad91cf2a0a0b9661382d1b0011306fb4e36902b
diff --git a/services/surfaceflinger/tests/unittests/Android.bp b/services/surfaceflinger/tests/unittests/Android.bp
index 25ce4ac..12b41fd 100644
--- a/services/surfaceflinger/tests/unittests/Android.bp
+++ b/services/surfaceflinger/tests/unittests/Android.bp
@@ -47,6 +47,7 @@
         "LayerMetadataTest.cpp",
         "SchedulerTest.cpp",
         "SchedulerUtilsTest.cpp",
+        "RefreshRateConfigsTest.cpp",
         "RefreshRateStatsTest.cpp",
         "TimeStatsTest.cpp",
         "mock/DisplayHardware/MockComposer.cpp",