bnxt_en: Do not setup PHY unless driving a single PF.

bnxt_en: Do not setup PHY unless driving a single PF.

Orabug: 25645429

If it is a VF or an NPAR function, the firmware call to setup the PHY
will fail.  Adding this check will prevent unnecessary firmware calls
to setup the PHY unless calling from the PF.  This will also eliminate
many unnecessary warning messages when the call from a VF or NPAR fails.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 33dac24abbd5a77eefca18fb7ebbd01a3cf1b343)
Signed-off-by: Brian Maly <brian.maly@oracle.com>