bnxt_en: Reject driver probe against all bridge devices

bnxt_en: Reject driver probe against all bridge devices

Orabug: 25645429

There are additional SoC devices that use the same device ID for
bridge and NIC devices.  The bnxt driver should reject probe against
all bridge devices since it's meant to be used with only endpoint
devices.

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>
(cherry picked from commit 4e00338a61998de3502d0428c4f71ffc69772316)
Signed-off-by: Brian Maly <brian.maly@oracle.com>