vulkan: Update vulkan.h to 1.0.13

vulkan.h and vk_platform.h imported from
github.com:KhronosGroup/Vulkan-Docs @ 2656f459333b3a1dc63619a9ebd83490eea22e93

Updated vulkan.api to reflect the changes in vulkan.h. There were no
changes to any of the code we generate. I didn't update the
vulkan_h.tmpl, since we're not currently using it and it was already
out of date.

Bug: 28878216
Change-Id: I71676683148fae7ad8799bd39386a931319aa395