nvk: Add A8B8G8R8_*_PACK32 format support
Here it is; the long-awaited change (as requested by 2 people on Discord 🥺)
This change originally added one Vulkan format which was needed for STK's Vulkan renderer, but @gfxstrand suggested to add all of the A8B8G8R8_*_PACK32 formats in a GitLab thread)
This obviously fixes SuperTuxKart crashing with the Vulkan renderer
Edited by Echo J.