Vulkan: Enable 8/16 bit storage buffer extensions The support for 8bit and 16bit storage buffers are exposed via VK_KHR_{8,16}bit_storage vulkan extensions. Add checks for these extensions and enable them if present. The changes in FeaturesVk_autogen.h in the change are generated by running the run_code_generation.py script. Bug: angleproject:8676 Signed-off-by: Gowtham Tammana <g.tammana@samsung.com> Change-Id: Idcda416e3eb6a735e021cd5bb0a182af341e9a16 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5491781 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>