Fix unused-parameter warnings

These are exposed when frameworks/av/include is moved from being a
system include directory to a normal include directory.

Test: m -j checkbuild
Change-Id: I0e3787fbee70339f7dcbc979f448800ecfff0f17
Merged-In: I0e3787fbee70339f7dcbc979f448800ecfff0f17
diff --git a/include/media/nbaio/NBAIO.h b/include/media/nbaio/NBAIO.h
index 120de4f..212f8e8 100644
--- a/include/media/nbaio/NBAIO.h
+++ b/include/media/nbaio/NBAIO.h
@@ -212,7 +212,7 @@
     // Returns NO_ERROR if a timestamp is available.  The timestamp includes the total number
     // of frames presented to an external observer, together with the value of CLOCK_MONOTONIC
     // as of this presentation count.  The timestamp parameter is undefined if error is returned.
-    virtual status_t getTimestamp(ExtendedTimestamp &timestamp) { return INVALID_OPERATION; }
+    virtual status_t getTimestamp(ExtendedTimestamp& /*timestamp*/) { return INVALID_OPERATION; }
 
 protected:
     NBAIO_Sink(const NBAIO_Format& format = Format_Invalid) : NBAIO_Port(format), mFramesWritten(0)
@@ -299,7 +299,7 @@
 
     // Invoked asynchronously by corresponding sink when a new timestamp is available.
     // Default implementation ignores the timestamp.
-    virtual void    onTimestamp(const ExtendedTimestamp& timestamp) { }
+    virtual void    onTimestamp(const ExtendedTimestamp& /*timestamp*/) { }
 
 protected:
     NBAIO_Source(const NBAIO_Format& format = Format_Invalid) : NBAIO_Port(format), mFramesRead(0)