Systemui memory regression, so we have to move the qr code activity back to Settings
Bug: 228031398
Test: manual
Change-Id: Ic30291e6d752c6c770c40e1329d9f95ceec8cca6
Add function for 'leave broadcast' button
Add function for 'Scan QR code' button
Set 'level broadcast' button gray out when device does not have broadcast source
Bug: 228259065
Test: build pass and manually test
Change-Id: Iab4a45e73f49c3f755b95ea3fa38872daac7e745