common/mlx5: wrap memory allocation on Windows

common/mlx5: wrap memory allocation on Windows

This commit is the Windows equivalent of the Linux implementation.  The
APIs included in this commit: mlx5_os_malloc(), mlx5_os_free(). For
memory allocations (with or without alignment) we always call
_aligned_malloc(). Even if zero alignment was requested in the first
place - we always select a minimal alignment value. In this way when the
memory is free - it is always safe to call _aligned_free().

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