Promote MappedTrackInfo.RendererSupport IntDef to public

This is referred to from the public API surface, so it should also be
public: https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/trackselection/MappingTrackSelector.MappedTrackInfo.html#getRendererSupport(int)

#minor-release

PiperOrigin-RevId: 421578232

library/core/src/main/java/com/google/android/exoplayer2/trackselection/MappingTrackSelector.java

@@ -67,7 +67,7 @@ public abstract class MappingTrackSelector extends TrackSelector {
       RENDERER_SUPPORT_EXCEEDS_CAPABILITIES_TRACKS,
       RENDERER_SUPPORT_PLAYABLE_TRACKS
     })
-    @interface RendererSupport {}
+    public @interface RendererSupport {}
     /** The renderer does not have any associated tracks. */
     public static final int RENDERER_SUPPORT_NO_TRACKS = 0;
     /**