SurfaceFlinger: move RefreshRateConfigs to a source file

Split RefreshRateConfigs to .h/.cpp

Test: adb shell /data/nativetest64/libsurfaceflinger_unittest/libsurfaceflinger_unittest
Bug: 141329414
Change-Id: Ifec7cc090d168115f2864bcb00d2be33aab9a664
3 files changed