constify JNINativeMethod function pointer tables

Change-Id: I4036c924958221cbc644724f8eb01c5de3cd7954
diff --git a/core/jni/android_hardware_camera2_legacy_PerfMeasurement.cpp b/core/jni/android_hardware_camera2_legacy_PerfMeasurement.cpp
index 7257597..f042058 100644
--- a/core/jni/android_hardware_camera2_legacy_PerfMeasurement.cpp
+++ b/core/jni/android_hardware_camera2_legacy_PerfMeasurement.cpp
@@ -302,7 +302,7 @@
 
 } // extern "C"
 
-static JNINativeMethod gPerfMeasurementMethods[] = {
+static const JNINativeMethod gPerfMeasurementMethods[] = {
     { "nativeCreateContext",
       "(I)J",
       (jlong *)PerfMeasurement_nativeCreateContext },