[PATCH] vt8231: Fix sysfs temperature interface

The VT8231 low temperature limits are actually hysteresis temperatures
to the high limits.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Roger Lucas <roger@planbit.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>