bug 14909: Define "length" as it relates to push constants be in units of bytes not words (WIP)

https://cvs.khronos.org/bugzilla/show_bug.cgi?id=14909
diff --git a/vulkan.py b/vulkan.py
index 40d41de..a74a615 100755
--- a/vulkan.py
+++ b/vulkan.py
@@ -955,8 +955,8 @@
             [Param("VkCmdBuffer", "cmdBuffer"),
              Param("VkPipelineLayout", "layout"),
              Param("VkShaderStageFlags", "stageFlags"),
-             Param("uint32_t", "start"),
-             Param("uint32_t", "length"),
+             Param("uint32_t", "offset"),
+             Param("uint32_t", "size"),
              Param("const void*", "values")]),
 
         Proto("void", "CmdBeginRenderPass",