net/mlx4: make the array states static const, makes object smaller

Don't populate the array states on the stack but instead it
static const. Makes the object code smaller by 79 bytes.

Before:
text data bss dec hex filename
21309 8304 192 29805 746d drivers/net/ethernet/mellanox/mlx4/qp.o

After:
text data bss dec hex filename
21166 8368 192 29726 741e drivers/net/ethernet/mellanox/mlx4/qp.o

(gcc version 10.2.0)

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Link: https://lore.kernel.org/r/20210801153742.147304-1-colin.king@canonical.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>