audio: Update 'PauseSync' scenario in AudioStreamIoOutTest

According to the definition of the 'PAUSED' state
in StreamDescriptor.aidl, s/w (the client) stops
writing once the buffer is filled up. That means, it is
allowed for an output stream not to consume data
from the MQ while in the paused state, so allow that
in the test.

Also, update the state transition sequence in the test
to flush any data after making a burst while in the 'PAUSED'
state.

Bug: 328010709
Test: atest VtsHalAudioCoreTargetTest
Change-Id: Icb5fd02ca4ede63d7ae33613ab66cb96f3e6df29
diff --git a/audio/aidl/vts/VtsHalAudioCoreModuleTargetTest.cpp b/audio/aidl/vts/VtsHalAudioCoreModuleTargetTest.cpp
index 039695b..e26b81b 100644
--- a/audio/aidl/vts/VtsHalAudioCoreModuleTargetTest.cpp
+++ b/audio/aidl/vts/VtsHalAudioCoreModuleTargetTest.cpp
@@ -1040,7 +1040,9 @@
                        << ": received invalid byte count in the reply: " << reply.fmqByteCount;
             return Status::ABORT;
         }
-        if (getDataMQ()->availableToWrite() != getDataMQ()->getQuantumCount()) {
+        // It is OK for the implementation to leave data in the MQ when the stream is paused.
+        if (reply.state != StreamDescriptor::State::PAUSED &&
+            getDataMQ()->availableToWrite() != getDataMQ()->getQuantumCount()) {
             LOG(ERROR) << __func__ << ": the HAL module did not consume all data from the data MQ: "
                        << "available to write " << getDataMQ()->availableToWrite()
                        << ", total size: " << getDataMQ()->getQuantumCount();
@@ -4550,9 +4552,8 @@
                                             std::make_pair(State::PAUSED, kStartCommand),
                                             std::make_pair(State::ACTIVE, kPauseCommand),
                                             std::make_pair(State::PAUSED, kBurstCommand),
-                                            std::make_pair(State::PAUSED, kStartCommand),
-                                            std::make_pair(State::ACTIVE, kPauseCommand)},
-                                           State::PAUSED);
+                                            std::make_pair(State::PAUSED, kFlushCommand)},
+                                           State::IDLE);
         if (!isSync) {
             idle.children().push_back(
                     d->makeNodes({std::make_pair(State::TRANSFERRING, kPauseCommand),