Make tee sink work again

It was broken by this earlier change to NBAIO:
  > Change-Id: I5eda412648b094358f5eefc38300e9ec8a734cd3
But the code was not being compiled, so the error was not caught earlier.

Also increase the default size of per-track pipe to a reasonable value.

Change-Id: Ica05017e6c6533e1fea9df379a9b204eebed4a1f
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 788559d..4c8b8af 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -183,6 +183,7 @@
         (void) property_get("af.tee", value, "0");
         teeEnabled = atoi(value);
     }
+    // FIXME symbolic constants here
     if (teeEnabled & 1) {
         mTeeSinkInputEnabled = true;
     }
@@ -1810,7 +1811,7 @@
             kind = TEE_SINK_NEW;
         } else if (mRecordTeeSink->getStrongCount() != 1) {
             kind = TEE_SINK_NO;
-        } else if (format == mRecordTeeSink->format()) {
+        } else if (Format_isEqual(format, mRecordTeeSink->format())) {
             kind = TEE_SINK_OLD;
         } else {
             kind = TEE_SINK_NEW;