net/mlx5_core: Fix notification of page supplement error

Some errors did not result with notifying firmware that the page request
could not be fulfilled. Fix this and put the notification logic into a
separate function.

Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>