Bluetooth: PBAP: Add Filters support.

This patch adds attribute filter support to PBAP. It will allow remote
devices to request the particular attributes.

Change-Id: Ia0a4f55f14925b0cf8d0553c64222d781edef2fd
CRs-Fixed: 509165
(cherry picked from commit e9442e7b3be1953bf79d00551988f4915a625645)
(cherry picked from commit d46ed2ccc3e385afbcb7550d87cc194283cd4e12)
(cherry picked from commit 9ab1ef2af42412a25d637a840e77f1221a57b12c)