[PATCH] I2C hwmon: hwmon sysfs class

This patch adds the sysfs class "hwmon" for use by hardware monitoring
(sensors) chip drivers.  It also fixes up the related Kconfig/Makefile
bits.

Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>