[intel] Add 8086:1557 card (Intel 82599 10G ethernet mezz)

Signed-off-by: Anton D. Kachalov <mouse@yandex-team.ru>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/intelx.c

 	PCI_ROM ( 0x8086, 0x10fb, "82599", "82599", 0 ),
 	PCI_ROM ( 0x8086, 0x1528, "x540at2", "X540-AT2", 0 ),
 	PCI_ROM ( 0x8086, 0x154d, "x520", "X520", 0 ),
+	PCI_ROM ( 0x8086, 0x1557, "82599", "82599", 0 ),
 };
 
 /** PCI driver */