crypto: qat - re-enable registration of algorithms

Re-enable the registration of algorithms after fixes to (1) use
pre-allocated buffers in the datapath and (2) support the
CRYPTO_TFM_REQ_MAY_BACKLOG flag.

This reverts commit 8893d27ffcaf6ec6267038a177cb87bcde4dd3de.

Cc: [e-mail]
Signed-off-by: Giovanni Cabiddu <[e-mail]>
Reviewed-by: Marco Chiappero <[e-mail]>
Reviewed-by: Adam Guerin <[e-mail]>
Reviewed-by: Wojciech Ziemba <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/qat/qat_4xxx/adf_drv.c

···
 	if (ret)
 		goto err;
 
-	/* Temporarily set the number of crypto instances to zero to avoid
-	 * registering the crypto algorithms.
-	 * This will be removed when the algorithms will support the
-	 * CRYPTO_TFM_REQ_MAY_BACKLOG flag
-	 */
-	instances = 0;
-
 	for (i = 0; i < instances; i++) {
 		val = i;
 		bank = i * 2;

drivers/crypto/qat/qat_common/qat_crypto.c

···
 	if (ret)
 		goto err;
 
-	/* Temporarily set the number of crypto instances to zero to avoid
-	 * registering the crypto algorithms.
-	 * This will be removed when the algorithms will support the
-	 * CRYPTO_TFM_REQ_MAY_BACKLOG flag
-	 */
-	instances = 0;
-
 	for (i = 0; i < instances; i++) {
 		val = i;
 		snprintf(key, sizeof(key), ADF_CY "%d" ADF_RING_ASYM_BANK_NUM, i);