vulkan: Update headers to 1.1.85

Key changes since 1.1.84:
* Added VK_NV_corner_sampled_image
* Added VK_NV_shading_rate_image
* Added VK_NVX_raytracing
* Added VK_NV_representative_fragment_test
* Added VK_NV_compute_shader_derivatives
* Added VK_NV_mesh_shader
* Added VK_NV_fragment_shader_barycentric
* Added VK_NV_shader_image_footprint
* Added VK_NV_scissor_exclusive

Test: build
Change-Id: Id580bc2ec72b3f4720eee31bb644afc145e83c99