Vulkan: Enable VK_EXT_depth_clamp_zero_one Replaced the 'depth_clamping' workaround with the dedicated extension or explicit fragment depth clamping. Fixed: angleproject:3970 Bug: angleproject:8077 Change-Id: Ia7666fcb3e0e949922c13a3fd11b818cbc5a8e26 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4545084 Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>