net/mlx5: move static asserts to global scope

net/mlx5: move static asserts to global scope

Some Windows compilers consider static_assert() as calls to another
function rather than a compiler directive which allows checking type
information at compile time.  This only occurs if the static_assert call
appears inside another function scope. To solve it move the
static_assert calls to global scope in the files where they are used.

Signed-off-by: Ophir Munk <ophirmu@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>