Update to use nativehelper/JNIPlatformHelp.h

Reflects refactoring of JNI helper code that depends on private
methods within libnativehelper.

Bug: 151443957
Test: Treehugger
Change-Id: I7af128f42ae89a77a8e3fb113ea533331153c535
diff --git a/media/jni/android_media_MediaMetadataRetriever.cpp b/media/jni/android_media_MediaMetadataRetriever.cpp
index 1c9b349..6fbd29c 100644
--- a/media/jni/android_media_MediaMetadataRetriever.cpp
+++ b/media/jni/android_media_MediaMetadataRetriever.cpp
@@ -30,7 +30,7 @@
 #include <private/media/VideoFrame.h>
 
 #include "jni.h"
-#include <nativehelper/JNIHelp.h>
+#include <nativehelper/JNIPlatformHelp.h>
 #include "android_runtime/AndroidRuntime.h"
 #include "android_media_MediaDataSource.h"
 #include "android_media_Streams.h"