constify JNINativeMethod function pointer tables

Change-Id: I4036c924958221cbc644724f8eb01c5de3cd7954
diff --git a/core/jni/android_hardware_UsbRequest.cpp b/core/jni/android_hardware_UsbRequest.cpp
index ce99e15..399e7b1 100644
--- a/core/jni/android_hardware_UsbRequest.cpp
+++ b/core/jni/android_hardware_UsbRequest.cpp
@@ -190,7 +190,7 @@
     return (usb_request_cancel(request) == 0);
 }
 
-static JNINativeMethod method_table[] = {
+static const JNINativeMethod method_table[] = {
     {"native_init",             "(Landroid/hardware/usb/UsbDeviceConnection;IIII)Z",
                                             (void *)android_hardware_UsbRequest_init},
     {"native_close",            "()V",      (void *)android_hardware_UsbRequest_close},