libpayload: Add pci_free_dev() and some boilerplate

Add just enough code and boilerplate to keep it compatible with future
libflashrom.

Change-Id: If0d46fab141da525f8f115d3f6045a8c417569eb
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/20955
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/payloads/libpayload/include/pci/pci.h b/payloads/libpayload/include/pci/pci.h
index ee79d45..da6d026 100644
--- a/payloads/libpayload/include/pci/pci.h
+++ b/payloads/libpayload/include/pci/pci.h
@@ -88,7 +88,14 @@
 	struct pci_dev *devices;
 };
 
+enum pci_access_type { /* dummy for code compatibility */
+	PCI_ACCESS_AUTO,
+	PCI_ACCESS_I386_TYPE1,
+	PCI_ACCESS_MAX
+};
+
 struct pci_access {
+	unsigned int method; /* dummy for code compatibility */
 	struct pci_dev *devices;
 };
 
@@ -108,5 +115,6 @@
 void pci_filter_init(struct pci_access*, struct pci_filter*);
 void pci_scan_bus(struct pci_access*);
 struct pci_dev *pci_get_dev(struct pci_access*, u16, u8, u8, u8);
+void pci_free_dev(struct pci_dev *);
 
 #endif
diff --git a/payloads/libpayload/libpci/libpci.c b/payloads/libpayload/libpci/libpci.c
index f715666..82203a1 100644
--- a/payloads/libpayload/libpci/libpci.c
+++ b/payloads/libpayload/libpci/libpci.c
@@ -219,3 +219,8 @@
 	cur->func = func;
 	return cur;
 }
+
+void pci_free_dev(struct pci_dev *const dev)
+{
+	free(dev);
+}