Config PCI_IOAPIC turned into a tristate in commit b95a7bd7, but no
module license is specified.  This adds the missing module license.
Signed-off-by: NAndrew Cooks <acooks@gmail.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NJan Beulich <jbeulich@suse.com>