hwmon: (sis5595) Split sis5595_attributes_opt

Use sysfs_create_group instead of individual calls to device_create_file by
splitting sis5595_attributes_opt into sis5595_attributes_in4 and
sis5595_attributes_temp1.

Signed-off-by: Ivo Manca <pinkel@gmail.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>