ART: Refactor libopenjdkjvmti

Move jvmti.h to its own folder and fix up include setup.

Bug: 31455788
Test: m
Change-Id: I5beb66fc5d0178746216f61f9214cda54fc2c7ac
diff --git a/runtime/openjdkjvmti/OpenjdkJvmTi.cc b/runtime/openjdkjvmti/OpenjdkJvmTi.cc
index 5e0d4bd..5401e5c 100644
--- a/runtime/openjdkjvmti/OpenjdkJvmTi.cc
+++ b/runtime/openjdkjvmti/OpenjdkJvmTi.cc
@@ -35,7 +35,7 @@
 
 #include <jni.h>
 
-#include "openjdkjvmti/jvmti.h"
+#include "jvmti.h"
 
 #include "art_jvmti.h"
 #include "base/logging.h"