MAINTAINERS: Add arch/x86/pci to PCI file patterns

I handle many arch/x86/pci changes, so help those patches get to the
PCI patchwork.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Ingo Molnar <mingo@kernel.org>

MAINTAINERS

@@ -6338,6 +6338,7 @@ S:	Supported
 F:	Documentation/PCI/
 F:	drivers/pci/
 F:	include/linux/pci*
+F:	arch/x86/pci/
 
 PCI DRIVER FOR NVIDIA TEGRA
 M:	Thierry Reding <thierry.reding@gmail.com>