Fix module name for VR HAL.

Change-Id: If6f5995755c7c30a5e9823c6a06e94dec7184240
diff --git a/include/hardware/vr.h b/include/hardware/vr.h
index 494f016..17a0606 100644
--- a/include/hardware/vr.h
+++ b/include/hardware/vr.h
@@ -23,7 +23,7 @@
 
 __BEGIN_DECLS
 
-#define VR_HARDWARE_MODULE_ID "vr_module"
+#define VR_HARDWARE_MODULE_ID "vr"
 
 #define VR_MODULE_API_VERSION_1_0 HARDWARE_MODULE_API_VERSION(1, 0)