Add explicit MAC address and display name fields

Replace List<List>mDeviceIds field in AssociationInfo with explicit
MacAddress mDeviceMacAddress and CharSequence mDeviceDisplayName fields.

Bug: 194301022
Test: atest CompanionDeviceManagerTest
Test: atest FrameworksUiServicesTests:NotificationManagerServiceTest
Change-Id: Ie8ae1c1154d3b53b1df8d612f116b514c99dc95c