Experiments with MAX6680 and MAX6681 show that the alert function of those
chips is broken, similar to other chips supported by the lm90 driver.
Mark it accordingly.
Fixes: 4667bcb8d8fc ("hwmon: (lm90) Introduce chip parameter structure")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
        },
        [max6680] = {
                .flags = LM90_HAVE_OFFSET | LM90_HAVE_CRIT
-                 | LM90_HAVE_CRIT_ALRM_SWP,
+                 | LM90_HAVE_CRIT_ALRM_SWP | LM90_HAVE_BROKEN_ALERT,
                .alert_alarms = 0x7c,
                .max_convrate = 7,
        },