Remove duplicate binding of RowContentBindStage

This did not need to be bound in the
ExpandableNotificationRowComponent as it was already injectable
globally. This silences a dagger warning that would have eventually
become an error:

Bug: 160781930
Test: manual && atest SystemUITests
Change-Id: I4286dc4d8f1bd431da35d2243006e263d5c1362f