crypto: picoxcell - replace strict_strtoul() with kstrtoul()

The usage of strict_strtoul() is not preferred, because
strict_strtoul() is obsolete. Thus, kstrtoul() should be
used.
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/picoxcell_crypto.c

@@ -1298,7 +1298,7 @@ static ssize_t spacc_stat_irq_thresh_store(struct device *dev,
 	struct spacc_engine *engine = spacc_dev_to_engine(dev);
 	unsigned long thresh;
 
-	if (strict_strtoul(buf, 0, &thresh))
+	if (kstrtoul(buf, 0, &thresh))
 		return -EINVAL;
 
 	thresh = clamp(thresh, 1UL, engine->fifo_sz - 1);