comp: Add setting to force a vulkan gpu index
By default Monado chooses a dedicated GPU to run the compositor on.
This change allows me to run xrgears with the compositor on my integrated GPU with XRT_COMPOSITOR_FORCE_GPU_INDEX=0.
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By default Monado chooses a dedicated GPU to run the compositor on.
This change allows me to run xrgears with the compositor on my integrated GPU with XRT_COMPOSITOR_FORCE_GPU_INDEX=0.