hwmon: (lm90) Fix sysfs and udev notifications

[ Upstream commit d379880d ]

sysfs and udev notifications need to be sent to the _alarm
attributes, not to the value attributes.

Fixes: 94dbd23e ("hwmon: (lm90) Use hwmon_notify_event()")
Cc: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>