Change buffer invalidataion FMQ to unsync

Buffer Invalidation FMQ is designed as a shared FMQ between clients in
order to minimize memory consumption. In that case, regarding FMQ is
unsync FMQ in order to not to block writer in any situation.

Bug: 112203066
Change-Id: I58989ccd332ba790193007f43dd66ecbd617f484
diff --git a/media/bufferpool/2.0/IAccessor.hal b/media/bufferpool/2.0/IAccessor.hal
index bd70945..ab7c02d 100644
--- a/media/bufferpool/2.0/IAccessor.hal
+++ b/media/bufferpool/2.0/IAccessor.hal
@@ -68,5 +68,5 @@
         generates (ResultStatus status, IConnection connection,
                    int64_t connectionId,
                    fmq_sync<BufferStatusMessage> toFmqDesc,
-                   fmq_sync<BufferInvalidationMessage> fromFmqDesc);
+                   fmq_unsync<BufferInvalidationMessage> fromFmqDesc);
 };