tu: expose VK_KHR_copy_commands2
Relevant CTS tests: dEQP-VK.api.copy_and_blit.copy_commands2.*
VKD3D started requiring VK_KHR_copy_commands2
so let's expose it.
Relevant CTS tests: dEQP-VK.api.copy_and_blit.copy_commands2.*
VKD3D started requiring VK_KHR_copy_commands2
so let's expose it.