hwmon: (lm90) Mark alert as broken for MAX6646/6647/6649

Experiments with MAX6646 and MAX6648 show that the alert function of those
chips is broken, similar to other chips supported by the lm90 driver.
Mark it accordingly.

Fixes: 4667bcb8 ("hwmon: (lm90) Introduce chip parameter structure")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/lm90.c

@@ -394,7 +394,7 @@ static const struct lm90_params lm90_params[] = {
 		.max_convrate = 9,
 	},
 	[max6646] = {
-		.flags = LM90_HAVE_CRIT,
+		.flags = LM90_HAVE_CRIT | LM90_HAVE_BROKEN_ALERT,
 		.alert_alarms = 0x7c,
 		.max_convrate = 6,
 		.reg_local_ext = MAX6657_REG_R_LOCAL_TEMPL,