Bluetooth: PBAP: Add support for PBAP UI preference

This pach adds support for PBAP UI preference in SettingsLib.
Without this change it is not possible to properly use the pbap
checkbox preference from Bluetooth subsettings menu. Also some map
profile specific bug fixes are also incorporated in this change.

Change-Id: I4981aa063b2541b58ce1d36e3576578cbeb02acc
CRs-Fixed: 758697