Remove dependencies on headers outside UI module

This includes AndroidRuntime and core_jni_helper.h

Bug: 137655431
Test: CtsUiRenderingTestCases
Change-Id: If3d26f41eaf4981505ee47634097f3645fd563fd
diff --git a/libs/hwui/jni/FontUtils.cpp b/libs/hwui/jni/FontUtils.cpp
index 0cf61b9..654c5fd 100644
--- a/libs/hwui/jni/FontUtils.cpp
+++ b/libs/hwui/jni/FontUtils.cpp
@@ -16,8 +16,7 @@
 
 #include "FontUtils.h"
 
-#include <nativehelper/JNIHelp.h>
-#include <core_jni_helpers.h>
+#include "graphics_jni_helpers.h"
 
 namespace android {
 namespace {