eal/bsd: remove clean up of files at startup

eal/bsd: remove clean up of files at startup

On FreeBSD, closing the file descriptor drops the lock even if the
file descriptor was mmap'ed. This leads to the cleanup at the end
of EAL init to remove fbarray files that are still in use by the
process itself.

However, instead of working around this issue, we can take advantage
of the fact that FreeBSD doesn't really create any per-process
files in the first place, so no cleanup is actually needed.

Fixes: 0a529578f162 ("eal: clean up unused files on initialization")
Cc: stable@dpdk.org
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>