[intel] Add PCI ID for I218-LM

Signed-off-by: Thomas Miletich <thomas.miletich@gmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/intel.c

 	PCI_ROM ( 0x8086, 0x1527, "82580-f2", "82580 Fiber", 0 ),
 	PCI_ROM ( 0x8086, 0x1533, "i210", "I210", 0 ),
 	PCI_ROM ( 0x8086, 0x153a, "i217lm", "I217-LM", 0 ),
+	PCI_ROM ( 0x8086, 0x155a, "i218lm", "I218-LM", 0),
 	PCI_ROM ( 0x8086, 0x153b, "i217v", "I217-V", 0 ),
 	PCI_ROM ( 0x8086, 0x294c, "82566dc-2", "82566DC-2", 0 ),
 	PCI_ROM ( 0x8086, 0x2e6e, "cemedia", "CE Media Processor", 0 ),