Bluedroid: Modify PBAP vCard filtering logic.

Modify vCard filtering logic to avoid unintended removal of
vCard attribute values. During applying filters do not
remove the entries directly from original vCard, but removes
it from the concerned token, and construct the filtered vCard with
the modified tokens and return the modified vCard.

Change-Id: I348605a9742854da6bd2e2a59167641f379d88b8
CRs-Fixed: 509165
(cherry picked from commit 15eed78f501353a17205dcea3fa23dc2222b06e2)
(cherry picked from commit df67d4a7a17db8a058483f1a4d48adb991d1688f)
(cherry picked from commit b05c9f2331a4c60c200e64f1ec84e3315bb5594b)