anv/device: keep track of 'device lost' state

The Vulkan specs say:

   "A logical device may become lost because of hardware errors, execution
    timeouts, power management events and/or platform-specific events. This
    may cause pending and future command execution to fail and cause hardware
    resources to be corrupted. When this happens, certain commands will
    return VK_ERROR_DEVICE_LOST (see Error Codes for a list of such commands).
    After any such event, the logical device is considered lost. It is not
    possible to reset the logical device to a non-lost state, however the lost
    state is specific to a logical device (VkDevice), and the corresponding
    physical device (VkPhysicalDevice) may be otherwise unaffected. In some
    cases, the physical device may also be lost, and attempting to create a
    new logical device will fail, returning VK_ERROR_DEVICE_LOST."

This means that we need to track if a logical device has been lost so we can
have the commands referenced by the spec return VK_ERROR_DEVICE_LOST
immediately.

Reviewed-by: Jason Ekstrand <[email protected]>

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