cryptodev: add missing doc for security context

[ upstream commit 1e71cb205047fd7f151018179279de92b2e92fa2 ]

Description for rte_cryptodev_get_sec_ctx is missing. Add the same.

Fixes: eadb4fa ("cryptodev: support security APIs")

Signed-off-by: Anoob Joseph <anoobj@marvell.com>
Acked-by: Akhil Goyal <gakhil@marvell.com>

lib/librte_cryptodev/rte_cryptodev.h

@@ -875,6 +875,15 @@ struct rte_cryptodev {
 	/**< Flag indicating the device is attached */
 } __rte_cache_aligned;
 
+/**
+ * Get the security context for the cryptodev.
+ *
+ * @param dev_id
+ *   The device identifier.
+ * @return
+ *   - NULL on error.
+ *   - Pointer to security context on success.
+ */
 void *
 rte_cryptodev_get_sec_ctx(uint8_t dev_id);