octeontx2-af: use dynamic interrupt vectors for CN10K

This patch updates the driver to use a dynamic number of vectors instead
of a hard-coded value. This change accommodates the CN10KB, which has 2
vectors, unlike the previously supported chips that have 3 vectors.

Signed-off-by: Srujana Challa <schalla@marvell.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>