vkdeviceprovider: Avoid deadlock on physical device
Don't hold the object lock on the vk physical device while constructing a GstVulkanDevice around it, as GstVulkanDevice can make calls on the physical device that require the object lock.
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Don't hold the object lock on the vk physical device while constructing a GstVulkanDevice around it, as GstVulkanDevice can make calls on the physical device that require the object lock.