Bluetooth: Add vCard version support for call history.

Under current implementation, PSE only deliver call history
under format VCard2.1 to PCE, this is not correct according to
PBAP specification, which says "The PSE shall support both
vCard2.1 and vCard3.0 versions and deliver the Entries to the
PCE under the format version that is requested by the PCE."
This fix is to make implementation following such PBAP
specificaiton.

Change-Id: Id0146d0887bad3bd066109ecd3be674b3106bced