Fix certain setting writes being incorrectly skipped.

If a value that previously had a very long value (over the 500 char
threshold) is now set to null, isRedundantSetValue would incorrectly
return true even though the value was changed.

Change-Id: Ia5304743024ec01024be98aa51ed260d38caf93c
Bluetooth: Support  HFP Client role on Bluedroid.

Implementation changes to support HFP Client role
on Bluedroid stack.

Change-Id: Ie37e95d3b0e3f785af818fb495c835e420792f4d