anv: implement EXT_depth_clip_control
A new extension allowing the application to use the OpenGL depth range in NDC, i.e. with depth in range [-1, 1], as opposed to Vulkan’s default of [0, 1].
Gitlab: #6070 (closed) Signed-off-by: Vadym Shovkoplias vadym.shovkoplias@globallogic.com