bnxt: Add PCIe device IDs for bcm58802/bcm58808

Add PCIe device ID for bcm58802 and bcm58808. Also add chip number
update to declare bcm588xx as chip class phase 4 and later

Signed-off-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>