bufferqueue@1.0: remove comment in function def

Bug: 124382459
Test: manual
Change-Id: Ia99990d6ba3d50d81eb58735212142ec88a74293
diff --git a/graphics/bufferqueue/1.0/IGraphicBufferProducer.hal b/graphics/bufferqueue/1.0/IGraphicBufferProducer.hal
index c59a16c..21cbc2e 100644
--- a/graphics/bufferqueue/1.0/IGraphicBufferProducer.hal
+++ b/graphics/bufferqueue/1.0/IGraphicBufferProducer.hal
@@ -546,7 +546,7 @@
      */
     disconnect(
             int32_t api,
-            DisconnectMode mode /* = DisconnectMode::API */
+            DisconnectMode mode
         ) generates (
             Status status
         );