PBAP: Strip unwanted braces from telephone number.

This patch removes unwanted spaces from the telephone
number on vcard entry formation. Handsfree call
was failing because of these characters due to
different BTIF handling in Bluedroid.

Change-Id: I2d63967059a9cb97f214b370fac17234f6e58f55
CRs-fixed: 533935
(cherry picked from commit 607c5a9c7ed1bf9b4ac3cdae369732bdead39853)
(cherry picked from commit 2b63c7b9a40148d4eb25f5979ebd32b2e98cfc06)
(cherry picked from commit c7fc85b1d28fb0325df413c67216e2ea49b90c61)