vulkan: update Vulkan headers to 1.0.49

Key changes since 1.0.46:
* Add VK_KHR_get_surface_capabilities2
* Add VK_KHR_shared_presentable_image
* Add VkObjectType enumeration to core API

The new commands added by VK_KHR_get_surface_capabilities2 are
commented out in vulkan.api since the current libvulkan template
doesn't handle them properly. They'll be uncommented along with the
corresponding template changes and implementation.

Test: mmm frameworks/native/vulkan
Merged-In: I1e4bd5d19f36af0d4e878b3971145a1ae1281dd6
Change-Id: I7aa110aa82735db4a82b631a60f875b5f1c96784