aaudio: refactor references to shared FIFO

Reduce passing of raw pointers.
Use shared_ptrs and unique_ptrs.
Simplify memory management.

Refactor FifoBuffer into two subclasses so that
the internal memory management is simpler.

Bug: 151650670
Test: OboeTester "TEST OUTPUT"
Test: disable EXCLUSIVE mode
Test: OboeTester "ECHO INPUT TO OUTPUT"
Test: disable INPUT EXCLUSIVE mode
Change-Id: I10981767f8719f3cc3525df211285c53219a7979
diff --git a/media/libaaudio/src/client/AudioEndpoint.cpp b/media/libaaudio/src/client/AudioEndpoint.cpp
index 06f66d3..0a19d17 100644
--- a/media/libaaudio/src/client/AudioEndpoint.cpp
+++ b/media/libaaudio/src/client/AudioEndpoint.cpp
@@ -137,7 +137,7 @@
         return AAUDIO_ERROR_INTERNAL;
     }
 
-    mUpCommandQueue = std::make_unique<FifoBuffer>(
+    mUpCommandQueue = std::make_unique<FifoBufferIndirect>(
             descriptor->bytesPerFrame,
             descriptor->capacityInFrames,
             descriptor->readCounterAddress,
@@ -166,7 +166,7 @@
                                   ? &mDataWriteCounter
                                   : descriptor->writeCounterAddress;
 
-    mDataQueue = std::make_unique<FifoBuffer>(
+    mDataQueue = std::make_unique<FifoBufferIndirect>(
             descriptor->bytesPerFrame,
             descriptor->capacityInFrames,
             readCounterAddress,