Use stopwatch_wait_until_expired where applicable

Change-Id: I4d6c6810b91294a7e401a4a1a446218c04c98e55
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/21590
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>

src/drivers/i2c/rx6110sa/rx6110sa.c

@@ -149,8 +149,7 @@ static void rx6110sa_init(struct device *dev)
 	 * Take the needed delay after a reset sequence into account before the
 	 * VLF-bit can be cleared.
 	 */
-	while (!stopwatch_expired(&sw))
-		;
+	stopwatch_wait_until_expired(&sw);
 	flags &= ~VLF_BIT;
 	rx6110sa_write(dev, FLAG_REGISTER, flags);