net/mlx5: Remove redundant cmdif revision check

[ Upstream commit 0714ec9e ]

mlx5 is checking the cmdif revision twice, for no reason.
Remove the latter check.

Signed-off-by: Shay Drory <shayd@nvidia.com>
Reviewed-by: Moshe Shemesh <moshe@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Stable-dep-of: d62b1404 ("net/mlx5: Fix command bitmask initialization")
Signed-off-by: Sasha Levin <sashal@kernel.org>