bnxt_en: Reserve resources for RFS.

bnxt_en: Reserve resources for RFS.

Orabug: 27648355, 27648339

In bnxt_rfs_capable(), add call to reserve vnic resources to support
NTUPLE.  Return true if we can successfully reserve enough vnics.
Otherwise, reserve the minimum 1 VNIC for normal operations not
supporting NTUPLE and return false.

Also, suppress warning message about not enough resources for NTUPLE when
only 1 RX ring is in use.  NTUPLE filters by definition require multiple
RX rings.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 6a1eef5b9079742ecfad647892669bd5fe6b0e3f)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>