Refactor PatchPanel

Major changes:

 * since PatchPanel is internal to AudioFlinger, and has the same
   lifetime period, there is no need to use reference counting;

 * setAudioPortConfig moved to AudioFlinger;

 * store Patches in std::map instead of SortedVector, and
   directly--not as pointers;

 * move {create|clear}PatchConnections into Patch class;

 * use __func__ in logging.

Test: test basic audio functionality on taimen
Change-Id: I813fd8430a0e97cd01cc74e6b3b828b10ff5acd4