Fix missing imports and package-info.java

PiperOrigin-RevId: 403071721

library/common/src/main/java/com/google/android/exoplayer2/upstream/crypto/AesCipherDataSink.java

@@ -19,6 +19,8 @@ import static com.google.android.exoplayer2.util.Util.castNonNull;
 import static java.lang.Math.min;
 
 import androidx.annotation.Nullable;
+import com.google.android.exoplayer2.upstream.DataSink;
+import com.google.android.exoplayer2.upstream.DataSpec;
 import java.io.IOException;
 import javax.crypto.Cipher;
 

library/common/src/main/java/com/google/android/exoplayer2/upstream/crypto/AesCipherDataSource.java

@@ -21,6 +21,9 @@ import static com.google.android.exoplayer2.util.Util.castNonNull;
 import android.net.Uri;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.C;
+import com.google.android.exoplayer2.upstream.DataSource;
+import com.google.android.exoplayer2.upstream.DataSpec;
+import com.google.android.exoplayer2.upstream.TransferListener;
 import java.io.IOException;
 import java.util.List;
 import java.util.Map;