PCI: Add capability list parser to romstage

These are almost one-to-one copies from pci_device.c. However,
devicetree has not been enumerated yet and we have no console.

Change-Id: Ic80c781626521d03adde05bdb1916acce31290ea
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5196
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/device/Makefile.inc

@@ -13,7 +13,8 @@ ramstage-$(CONFIG_ARCH_X86) += pnp_device.c
 ramstage-$(CONFIG_PCI) += pci_ops.c
 ramstage-y += smbus_ops.c
 
-romstage-y+= device_romstage.c
+romstage-y += device_romstage.c
+romstage-$(CONFIG_PCI) += pci_early.c
 
 subdirs-y += oprom