misc: Update to Vulkan header version 20

Changes:
vulkan.h
json files
linux SO version
loader and tests to reflect API change in vkCmdUpdateBuffer
vk.xml to match Vulkan-Docs

Change-Id: I1763bca6fccf619ad8e76c0363f68fa38ad69900
diff --git a/tests/vkrenderframework.cpp b/tests/vkrenderframework.cpp
index 1723655..b939929 100644
--- a/tests/vkrenderframework.cpp
+++ b/tests/vkrenderframework.cpp
@@ -1505,7 +1505,7 @@
 
 void VkCommandBufferObj::UpdateBuffer(VkBuffer buffer, VkDeviceSize dstOffset,
                                       VkDeviceSize dataSize,
-                                      const uint32_t *pData) {
+                                      const void *pData) {
     vkCmdUpdateBuffer(handle(), buffer, dstOffset, dataSize, pData);
 }