vulkan: Update headers to 1.1.84

Key changes since 1.1.82:
* Added VK_KHR_vulkan_memory_model
* Added VK_EXT_astc_decode_mode
* Added VK_EXT_inline_uniform_block
* Non-trivial changes to VK_EXT_vertex_attribute_divisor (v2)

Test: build
Change-Id: I6a1b4d4818c3e3e51a2a89d62738ff80075dd509
2 files changed