[TG3]: add bcm5752 to tg3_pci_tbl

Add hard-coded definition of bcm5752 PCI ID to tg3_pci_tbl.
Next patch will change entry to use pci_ids.h-based definition.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>