net/mlx4_core: Capping number of requested MSIXs to MAX_MSIX

net/mlx4_core: Capping number of requested MSIXs to MAX_MSIX

[ Upstream commit 9293267a3e2a7a2555d8ddc8f9301525e5b03b1b ]

We currently manage IRQs in pool_bm which is a bit field
of MAX_MSIX bits. Thus, allocating more than MAX_MSIX
interrupts can't be managed in pool_bm.
Fixing this by capping number of requested MSIXs to
MAX_MSIX.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Carol L Soto <clsoto@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>