Refactor the layout of media route controller dialog

- Apply the UX layout size for the media route control frame and volume layout.
- Remove outer ScrollView.
- Split media route control frame into several views for making easy to handle
  the group expansion UX.
- Update play and pause control icons with 48*48 size.
- Make the close button always shown.

Bug: 23117610
Change-Id: I5022a45761c99cc0e046b041e1798740c0adaeb4
21 files changed