Reference nativehelper/jni.h as jni.h

nativehelper will no longer export nativehelper/jni.h so that everywhere
can reference this file with the same name.

Bug: 63762847
Change-Id: I3e58d478a2eb17b19db540414545a3c1f9c381af

media/jni/midi/android_media_midi_MidiDevice.cpp

@@ -18,8 +18,8 @@
 #define LOG_TAG "Midi-JNI"
 
 #include <android_util_Binder.h>
+#include <jni.h>
 #include <midi_internal.h>
-#include <nativehelper/jni.h>
 #include <utils/Log.h>
 
 using namespace android;