Remove extra padding between Notification header and inline_controls

- Make header in notification_info / partial_conversation_info
  wrap_content, same way that notification_conversation_info does, add
  add a 11dp padding at top of the header

Test: Manual (See Bug)
Bug: 153886426
Change-Id: If57ce8d3c2badf8d7a80e7396f5bb8f1b3605ebc