cnic: Disable statistics initialization for eth clients that do not support statistics

Disable statistics initialization for eth clients that do not support
 statistics. This prevents memory corruption on bnx2x hw.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>