hwmon: (max6650) Use permission specific SENSOR[_DEVICE]_ATTR variants

Use SENSOR[_DEVICE]_ATTR[_2]_{RO,RW,WO} to simplify the source code,
to improve readability, and to reduce the chance of inconsistencies.

Also replace any remaining S_<PERMS> in the driver with octal values.

The conversion was done automatically with coccinelle. The semantic patches
and the scripts used to generate this commit log are available at
https://github.com/groeck/coccinelle-patches/hwmon/.

This patch does not introduce functional changes. It was verified by
compiling the old and new files and comparing text and data sizes.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/max6650.c

@@ -52,9 +52,9 @@ static int prescaler;
 /* clock: The clock frequency of the chip (max6651 can be clocked externally) */
 static int clock = 254000;
 
-module_param(fan_voltage, int, S_IRUGO);
-module_param(prescaler, int, S_IRUGO);
-module_param(clock, int, S_IRUGO);
+module_param(fan_voltage, int, 0444);
+module_param(prescaler, int, 0444);
+module_param(clock, int, 0444);
 
 /*
  * MAX 6650/6651 registers