[infiniband] Add qword accessors for ib_guid and ib_gid

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/ib_packet.h

 	uint8_t bytes[8];
 	uint16_t words[4];
 	uint32_t dwords[2];
+	uint64_t qword;
 };
 
 /** Infiniband Globally Unique Identifier debug message format */
 	uint8_t bytes[16];
 	uint16_t words[8];
 	uint32_t dwords[4];
+	uint64_t qwords[2];
 	struct {
 		union ib_guid prefix;
 		union ib_guid guid;