bnx2x: prevent VF benign attentions

During probe, VFs might erroneously try to access the shared memory (which
only PFs are capabale of accessing), causing benign attentions to appear.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>