Add some imports required for javadoc

#minor-release

PiperOrigin-RevId: 452002758
(cherry picked from commit f76baaee)

library/common/src/main/java/com/google/android/exoplayer2/source/TrackGroup.java

@@ -25,6 +25,7 @@ import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.Bundleable;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.Format;
+import com.google.android.exoplayer2.Tracks;
 import com.google.android.exoplayer2.util.BundleableUtil;
 import com.google.android.exoplayer2.util.Log;
 import com.google.android.exoplayer2.util.MimeTypes;

library/common/src/main/java/com/google/android/exoplayer2/trackselection/TrackSelectionParameters.java

@@ -29,6 +29,7 @@ import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import com.google.android.exoplayer2.Bundleable;
 import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.source.TrackGroup;
 import com.google.android.exoplayer2.util.BundleableUtil;
 import com.google.android.exoplayer2.util.Util;