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: 1061628