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vulkan/runtime: Add helper functions for VK_EXT_host_image_copy

Rebecca Mckeever requested to merge rmckeever/mesa:host-image-copy-memory-copy-layout into main

What does this MR do and why?

Adds helper functions vk_memory_to_image_copy_layout and vk_image_to_memory_copy_layout, which will be useful in VK_EXT_host_image_copy implementations.

vk_memory_to_image_copy_layout() is similar to vk_image_buffer_copy_layout(), except the second parameter is VkMemoryToImageCopyEXT instead of VkBufferImageCopy2.

vk_image_to_memory_copy_layout() is similar to vk_image_buffer_copy_layout(), except the second parameter is VkImageToMemoryCopyEXT instead of VkBufferImageCopy2.

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