[backport] Add "hvm-pirq" platform key - #7239
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The HVM PIRQ feature is known to have compatibility issues with some AMD GPUs. It has been disabled by default in Xenlight version 024e7131be5c. Add a platform control for hvm-pirq to allow it to be disabled. The control defaults to false, which disables this feature on existing VMs after a reboot. Also add it to the filtered_flags list to prevent it from being disabled by the platform_filter feature. Tested-by: Teddy Astie <teddy.astie@vates.tech> Signed-off-by: Tu Dinh <ngoc-tu.dinh@vates.tech> (cherry picked from commit e9c10d6)
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Backport of #7235