pci: Add a macro to convert BDF from linux to U-Boot

U-Boot's BDF format has its bits in the same position as the device tree
PCI definition.

Some x86 devices use linux format in their register format and it is
useful to be able to convert to U-Boot format. Add a macro for this.
Signed-off-by: NSimon Glass <sjg@chromium.org>

include/pci.h

@@ -543,6 +543,9 @@ typedef int pci_dev_t;
 #define PCI_VENDEV(v, d)	(((v) << 16) | (d))
 #define PCI_ANY_ID		(~0)
 
+/* Convert from Linux format to U-Boot format */
+#define PCI_TO_BDF(val)		((val) << 8)
+
 struct pci_device_id {
 	unsigned int vendor, device;	/* Vendor and device ID or PCI_ANY_ID */
 	unsigned int subvendor, subdevice; /* Subsystem ID's or PCI_ANY_ID */