examples/fips_validation: remove illegal usage of API

examples/fips_validation: remove illegal usage of API

Some of the cryptodev APIs are not allowed to be used
by application directly. Hence removing the usage of
1. queue_pair_release: it is not required, as configure
   of queue pair release the previous queue pairs and the
   dev is not directly exposed to application, hence cannot
   use its ops from app.
2. rte_cryptodev_stop: it can be used directly without
   checking if the device is started or not.
3. rte_cryptodev_pmd_destroy: application should use
   rte_cryptodev_close instead.

Signed-off-by: Akhil Goyal <gakhil@marvell.com>
Acked-by: Matan Azrad <matan@nvidia.com>
Acked-by: Hemant Agrawal <hemant.agrawal@nxp.com>