aaudio: improve error logging

Report when INVALID_STATE returned.
This was used to debug monkey test errors.
Cleanup some log messages.
Improve "dumpsys media.aaudio"

Bug: 64310586
Test: CTS nativemedia/aaudio
Change-Id: Ifbcac4794cda22cccbacff6352243c0ef4589c53
diff --git a/services/oboeservice/AAudioServiceEndpoint.cpp b/services/oboeservice/AAudioServiceEndpoint.cpp
index 6c345cd..81f1d1b 100644
--- a/services/oboeservice/AAudioServiceEndpoint.cpp
+++ b/services/oboeservice/AAudioServiceEndpoint.cpp
@@ -64,8 +64,9 @@
     }
 
     result << "    Registered Streams:" << "\n";
+    result << AAudioServiceStreamShared::dumpHeader() << "\n";
     for (sp<AAudioServiceStreamShared> sharedStream : mRegisteredStreams) {
-        result << sharedStream->dump();
+        result << sharedStream->dump() << "\n";
     }
 
     if (isLocked) {