audio policy: fix direct output profile selection

Fix logic in AudioPolicyManager::getProfileForDirectOutput()
to select the direct output with most matching flags and not just
the first compatible one.

Also fixes issue 17783395 which was fixed by commit f7bc29b02
in lmp-tv-dev branch only but in a way that caused a regression
for HW A/V sync (issue 19384172).

Also removed duplicated code lines in getOutputForDevice()

Bug: 20819715.
Bug: 17783395.
Bug: 19384172.

Change-Id: I7fc793b37f9b53fabd92cab6b884ef85cfdafee4