vulkan/wsi: split out drm specifics of image
On Windows, we don't have DMABUF or DRM modifiers. So let's move these into a specific wsi_drm_image struct instead of in wsi_image directly.
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On Windows, we don't have DMABUF or DRM modifiers. So let's move these into a specific wsi_drm_image struct instead of in wsi_image directly.