Add support for remembering Wifi display devices.

Add a setting to globally disable Wifi display.

Fixed a bug where the wifi display broadcast receiver
was running on the wrong thread.

Removed the wifi-display QuickSettings dialog, all functionality
has been moved to Settings.

Bug: 7178216
Bug: 7192799
Change-Id: I9796baac8245d664cf28fa147b9ed978d81d8ab9