stateless: Add layerCount VU for CmdClearAttachments

Change-Id: I5f0864bc0bc7084da0706aac67c155ff1a7c2cad
diff --git a/scripts/parameter_validation_generator.py b/scripts/parameter_validation_generator.py
index a5f174c..0931584 100644
--- a/scripts/parameter_validation_generator.py
+++ b/scripts/parameter_validation_generator.py
@@ -157,6 +157,7 @@
             'vkCmdDraw',
             'vkCmdDrawIndirect',
             'vkCmdDrawIndexedIndirect',
+            'vkCmdClearAttachments',
             'vkCmdCopyImage',
             'vkCmdBlitImage',
             'vkCmdCopyBufferToImage',