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v3dv: drm format modifier fixes

Iago Toral requested to merge itoral/mesa:v3dv_drm_format_mod_fixes into main

We can't expose VK_EXT_image_drm_format_modifier yet (it depends on VK_KHR_sampler_ycbcr_conversion), but we had a partial implementation because the Vulkan WSI implementation relies on some of this functionality. This MR adds a couple of small things that were missing.

With these changes, if we expose VK_EXT_image_drm_format_modifier and work around a limitation in the current CTS test coverage, we pass all the tests we support under dEQP-VK.drm_format_modifiers.

Edited by Iago Toral

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