be2net: Don't run ethtool self-tests for VFs

be2net: Don't run ethtool self-tests for VFs

The CMD_SUBSYSTEM_LOWLEVEL cmds need DEV_CFG Privilege to run
which VFs don't have by default.
Self-tests need to be issued only for PFs.

Signed-off-by: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Suresh Reddy <suresh.reddy@broadcom.com>
Orabug: 22725582
Signed-off-by: Manjunath Govindashetty <manjunath.govindashetty@oracle.com>