common/mlx5/linux: replace malloc and free in glue

common/mlx5/linux: replace malloc and free in glue

This commit replaces mlx5_malloc and mlx5_free calls with Linux calls
malloc and free in file mlx5_glue.c.
The current mlx5_malloc calls have no flags, alignment or socket
selection, so they are equivalent to calling malloc.  Rdma-core itself
is using malloc.  When using mlx5_malloc the glue library is dependent
on common_mlx5 library which must be compiled first.  Not doing so and
in case ibverbs_link=dlopen will result in compilation failure:
mlx5_glue.c: undefined reference to `mlx5_malloc'.
To make all of this simpler and remove the common_mlx5 dependency - this
commit does the alloc/free replacements.

Fixes: 66914d19d135 ("common/mlx5: convert control path memory to unified malloc")
Cc: stable@dpdk.org
Signed-off-by: Ophir Munk <ophirmu@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>