MAINTAINERS: Add arch/x86/kernel/quirks.c to PCI file patterns

I'm not asserting any claim over arch/x86/kernel/quirks.c, and I don't plan
to merge changes to it, but some of the quirks there are PCI-related, and
I'd like to see changes to them.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

MAINTAINERS

@@ -6693,6 +6693,7 @@ F:	Documentation/PCI/
 F:	drivers/pci/
 F:	include/linux/pci*
 F:	arch/x86/pci/
+F:	arch/x86/kernel/quirks.c
 
 PCI DRIVER FOR IMX6
 M:	Richard Zhu <r65037@freescale.com>