constify JNINativeMethod function pointer tables

Change-Id: I4036c924958221cbc644724f8eb01c5de3cd7954
diff --git a/core/jni/android_hardware_UsbDevice.cpp b/core/jni/android_hardware_UsbDevice.cpp
index ef3b646..89d33e2 100644
--- a/core/jni/android_hardware_UsbDevice.cpp
+++ b/core/jni/android_hardware_UsbDevice.cpp
@@ -44,7 +44,7 @@
     return result;
 }
 
-static JNINativeMethod method_table[] = {
+static const JNINativeMethod method_table[] = {
     // static methods
     { "native_get_device_id", "(Ljava/lang/String;)I",
                                         (void*)android_hardware_UsbDevice_get_device_id },