net/mlx5: Make the command interface cache more flexible

Add more cache command size sets and more entries for each set based on
the current commands set different sizes and commands frequency.

Fixes: e126ba97

 ('mlx5: Add driver for Mellanox Connect-IB adapters')
Signed-off-by: Mohamad Haj Yahia <mohamad@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>