[tg3] Add PCI ID for BCM5786

Contributed by Steve Cayford <cayfo001@umn.edu>

src/drivers/net/tg3.c

 PCI_ROM(0x14e4, 0x167a, "tg3-5754",        "Broadcom Tigon 3 5754"),
 PCI_ROM(0x14e4, 0x1693, "tg3-5787",	   "Broadcom Tigon 3 5787"),
 PCI_ROM(0x14e4, 0x1696, "tg3-5782",        "Broadcom Tigon 3 5782"),
+PCI_ROM(0x14e4, 0x169a, "tg3-5786",        "Broadcom Tigon 3 5786"),
 PCI_ROM(0x14e4, 0x169c, "tg3-5788",        "Broadcom Tigon 3 5788"),
 PCI_ROM(0x14e4, 0x169d, "tg3-5789",        "Broadcom Tigon 3 5789"),
 PCI_ROM(0x14e4, 0x16a6, "tg3-5702X",       "Broadcom Tigon 3 5702X"),