loader: default to iris for all future PCI IDs
The existing "fallback" code didn't actually do anything, so this removes it, and instead we just always fallback to `iris` for future PCI IDs. Suggested-by: Kenneth Graunke <kenneth@whitecape.org> Signed-off-by: Eric Engestrom <eric.engestrom@intel.com> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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