libpayload/libpci: Add a constant for PCI class memory other

Change-Id: I71e902c4ec843608c1518fe1e8b90fbcf98a13d1
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/20930
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

payloads/libpayload/include/pci/pci.h

@@ -67,6 +67,8 @@
 #define PCI_ROM_ADDRESS1	0x38 // on bridges
 #define PCI_ROM_ADDRESS_MASK	~0x7ff
 
+#define PCI_CLASS_MEMORY_OTHER	0x0580
+
 #define PCI_VENDOR_ID_INTEL 0x8086
 
 struct pci_dev {