Revert "crypto: caam - adjust RNG timing to support more devices"

This reverts commit ef492d08.

This patch breaks the RNG on i.MX8MM.
Reported-by: Bastian Krause <bst@pengutronix.de>
Link: https://lore.kernel.org/all/e1f3f073-9d5e-1bae-f4f8-08dc48adad62@pengutronix.de/Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/caam/ctrl.c

@@ -382,8 +382,8 @@ static void kick_trng(struct device *dev, int ent_delay)
 		val = ent_delay;
 		/* min. freq. count, equal to 1/4 of the entropy sample length */
 		wr_reg32(&r4tst->rtfrqmin, val >> 2);
-		/* max. freq. count, equal to 16 times the entropy sample length */
-		wr_reg32(&r4tst->rtfrqmax, val << 4);
+		/* disable maximum frequency count */
+		wr_reg32(&r4tst->rtfrqmax, RTFRQMAX_DISABLE);
 	}
 
 	wr_reg32(&r4tst->rtsdctl, (val << RTSDCTL_ENT_DLY_SHIFT) |