bnxt_en: Cap the msix vector with the max completion rings.

bnxt_en: Cap the msix vector with the max completion rings.

Orabug: 26402533, 26325599, 26366387

The current code enables up to the maximum MSIX vectors in the PCIE
config space without considering the max completion rings available.
An MSIX vector is only useful when it has an associated completion
ring, so it is better to cap it.

Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 68a946bb81e07ed0e59a99e0c068d091ed42cc1b)
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Signed-off-by: Somasundaram Krishnasamy <somasundaram.krishnasamy@oracle.com>