dm: x86: pci: Add a PCI driver for driver model

Add a simple x86 PCI driver which uses standard functions provided by the
architecture.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index c1c2ae3c..adc238f 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -9,6 +9,7 @@
 obj-$(CONFIG_PCI) += pci-uclass.o pci_compat.o
 obj-$(CONFIG_PCI_SANDBOX) += pci_sandbox.o
 obj-$(CONFIG_SANDBOX) += pci-emul-uclass.o
+obj-$(CONFIG_X86) += pci_x86.o
 else
 obj-$(CONFIG_PCI) += pci.o
 endif