layers: Move PV to use new extension helper

Change-Id: Ia11632d241b0c717364cc8a2a26d3daaa66bcde5
diff --git a/layers/parameter_validation_utils.h b/layers/parameter_validation_utils.h
index 0d6ec26..0f4bdb6 100644
--- a/layers/parameter_validation_utils.h
+++ b/layers/parameter_validation_utils.h
@@ -30,7 +30,7 @@
 #include "vk_enum_string_helper.h"
 #include "vk_layer_logging.h"
 #include "vk_validation_error_messages.h"
-#include "device_extensions.h"
+#include "vk_extension_helper.h"
 
 
 #include "parameter_name.h"