Bug: vk2dfd fails to produce DFD for VK FORMAT R16G16 S10 5 NV and related fixed‑point formats

Bug: vk2dfd fails to produce DFD for VK FORMAT R16G16 S10 5 NV and related fixed‑point formats: a task in LegoFlow-SWE (Harbor dataset). For related YUV 422 single‑plane formats, the DFD should similarly capture the correct channel mapping, sample sizes, and offsets, and dfd2vk must be able to…

The task

For related YUV 422 single‑plane formats, the DFD should similarly capture the correct channel mapping, sample sizes, and offsets, and `dfd2vk` must be able to recover the corresponding Vulkan format.

Part of Lego-X/LegoFlow-SWE.