thermal: hwmon: use permission-specific DEVICE_ATTR variants

Use DEVICE_ATTR_RO for read only attributes.  This simplifies the
source code, improves readbility, and reduces the chance of
inconsistencies.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@ro@
declarer name DEVICE_ATTR;
identifier x,x_show;
@@

DEVICE_ATTR(x, \(0444\|S_IRUGO\), x_show, NULL);

@script:ocaml@
x << ro.x;
x_show << ro.x_show;
@@

if not (x^"_show" = x_show) then Coccilib.include_match false

@@
declarer name DEVICE_ATTR_RO;
identifier ro.x,ro.x_show;
@@

- DEVICE_ATTR(x, \(0444\|S_IRUGO\), x_show, NULL);
+ DEVICE_ATTR_RO(x);
// </smpl>
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>

drivers/thermal/thermal_hwmon.c

@@ -64,7 +64,7 @@ name_show(struct device *dev, struct device_attribute *attr, char *buf)
 	struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 	return sprintf(buf, "%s\n", hwmon->type);
 }
-static DEVICE_ATTR(name, 0444, name_show, NULL);
+static DEVICE_ATTR_RO(name);
 
 static ssize_t
 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)