iommu/vt-d: Do not falsely log intel_iommu is unsupported kernel option
Handling of intel_iommu kernel command line option should return "true" to indicate option is valid and so avoid logging it as unknown by the core parsing code. Also log unknown sub-options at the notice level to let user know of potential typos or similar. Reported-by: NEero Tamminen <eero.t.tamminen@intel.com> Signed-off-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://lore.kernel.org/r/20210831112947.310080-1-tvrtko.ursulin@linux.intel.comSigned-off-by: NLu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20211014053839.727419-2-baolu.lu@linux.intel.comSigned-off-by: NJoerg Roedel <jroedel@suse.de>
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