PM / sysfs: Convert to use DEVICE_ATTR_RO / DEVICE_ATTR_RW

Use DEVICE_ATTR_RO() and DEVICE_ATTR_RW() macros instead of
open coding them.

No functional change intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>