audio: Make renamings suggested by reviewers

Rename DriverInterface::getPosition -> refinePosition. This reflects
the fact that the driver may provide more precise position, however
this is an optional operation.

Rename StreamIn/Out::mContext -> mContextInstance. This is
to emphasize that StreamIn/Out actually own the context and they
hold the real context instance, not just a reference/pointer
to it, like other classes involved in the inheritance chain.

Bug: 286914845
Test: atest VtsHalAudioCoreTargetTest
Change-Id: Id7159f9bf3ee020dc7cf594ec35f5d59d23d7e31
(cherry picked from commit 459b7331e9145ee7cd8d35b621996fb66412a2a9)
Merged-In: Id7159f9bf3ee020dc7cf594ec35f5d59d23d7e31
diff --git a/audio/aidl/default/stub/StreamStub.cpp b/audio/aidl/default/stub/StreamStub.cpp
index 66f4605..9b6a759 100644
--- a/audio/aidl/default/stub/StreamStub.cpp
+++ b/audio/aidl/default/stub/StreamStub.cpp
@@ -120,11 +120,10 @@
 
 StreamInStub::StreamInStub(StreamContext&& context, const SinkMetadata& sinkMetadata,
                            const std::vector<MicrophoneInfo>& microphones)
-    : StreamIn(std::move(context), microphones), StreamStub(&(StreamIn::mContext), sinkMetadata) {}
+    : StreamIn(std::move(context), microphones), StreamStub(&mContextInstance, sinkMetadata) {}
 
 StreamOutStub::StreamOutStub(StreamContext&& context, const SourceMetadata& sourceMetadata,
                              const std::optional<AudioOffloadInfo>& offloadInfo)
-    : StreamOut(std::move(context), offloadInfo),
-      StreamStub(&(StreamOut::mContext), sourceMetadata) {}
+    : StreamOut(std::move(context), offloadInfo), StreamStub(&mContextInstance, sourceMetadata) {}
 
 }  // namespace aidl::android::hardware::audio::core