anv/image: Fix choose_isl_surf_usage()
anv/image: Fix choose_isl_surf_usage()

Don't translate VkImageCreateInfo::usage into an isl_surf_usage bitmask.
Instead, translate anv_image::usage, which is a superset of
VkImageCreateInfo::usage.

For-Issue: https://gitlab.khronos.org/vulkan/mesa/issues/26

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler