[mlir][vulkan-runner] fix VK_ERROR_INCOMPATIBLE_DRIVER error

On macOS, Vulkan is emulated by MoltenVK. Some extra flags are
required for "building robust and portable Vulkan based
applications that are good citizens in the Vulkan ecosystem".

More information:
https://vulkan.lunarg.com/doc/sdk/1.3.216.0/mac/getting_started.html

Reviewed By: antiagainst

Differential Revision: https://reviews.llvm.org/D128173