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Draft: vulkan: Add a helper function to support explicit layouts

Roman Stratiienko requested to merge roman.stratiienko/mesa:vk-gralloc-to-layouts into main

What does this MR do and why?

The function extracts buffer information from the gralloc and fills the VkImageDrmFormatModifierExplicitCreateInfoEXT structure, making possible to rely on VK_EXT_image_drm_format_modifier logic for importing gralloc buffers.

A few MRs that are currently on review may benefit from this functionality already. Quick review/merge is appreciated. Tested in scope of !14195 (merged).

Edited by Roman Stratiienko

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