PCI: Add GPL license for drivers/pci/ioapic module

Config PCI_IOAPIC turned into a tristate in commit b95a7bd70046, but no
module license is specified.  This adds the missing module license.

Signed-off-by: Andrew Cooks <acooks@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
diff --git a/drivers/pci/ioapic.c b/drivers/pci/ioapic.c
index 205af8d..22436f7 100644
--- a/drivers/pci/ioapic.c
+++ b/drivers/pci/ioapic.c
@@ -125,3 +125,5 @@
 
 module_init(ioapic_init);
 module_exit(ioapic_exit);
+
+MODULE_LICENSE("GPL");