header: Move vk.xml to version 1.0.29
header: Move vk.xml to version 1.0.29

Change-Id: Iae35f784b40eeafe07e1cf1af96924bd151ecd59

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools