Remove NdkJavaVMHelper.h from NDK directory

NdkJavaVMHelper.h is not a valid NDK header. Replace this one with
NdkJavaVMHelperPriv.h in the cpp directory.

Bug: 149578834
Test: NativeDecoderTest
Change-Id: I07ddec4d31ae84bf4a739fcf512859f794cb1baa
diff --git a/media/ndk/NdkJavaVMHelper.cpp b/media/ndk/NdkJavaVMHelper.cpp
index baf2744..a77016c 100644
--- a/media/ndk/NdkJavaVMHelper.cpp
+++ b/media/ndk/NdkJavaVMHelper.cpp
@@ -16,7 +16,7 @@
 
 #define LOG_TAG "NdkJavaVMHelper"
 
-#include <media/NdkJavaVMHelper.h>
+#include "NdkJavaVMHelperPriv.h"
 #include <utils/Log.h>
 
 namespace android {