[undi] Work around broken HP EliteBook 745 G3 PXE ROM

Reported-by: Arturino Mazzei <mazzeia@hotmail.com>
Tested-by: Arturino Mazzei <mazzeia@hotmail.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/arch/x86/drivers/net/undinet.c

 	/* HP XX70x laptops */
 	{ .pci_vendor = 0x8086, .pci_device = 0x1502 },
 	{ .pci_vendor = 0x8086, .pci_device = 0x1503 },
+	/* HP 745 G3 laptop */
+	{ .pci_vendor = 0x14e4, .pci_device = 0x1687 },
 };
 
 /**