PM / Domains: Drop comment in genpd about legacy Samsung DT binding

The parsing of the Samsung specific DT binding is gone, but the comment in
the function header remained. Let's drop the comment to avoid confusions.

Fixes: 001d50c9a14f (PM / Domains: Remove obsolete "samsung,power-domain" check)
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/domain.c

@@ -2185,9 +2185,6 @@ static void genpd_dev_pm_sync(struct device *dev)
  * Parse device's OF node to find a PM domain specifier. If such is found,
  * attaches the device to retrieved pm_domain ops.
  *
- * Both generic and legacy Samsung-specific DT bindings are supported to keep
- * backwards compatibility with existing DTBs.
- *
  * Returns 0 on successfully attached PM domain or negative error code. Note
  * that if a power-domain exists for the device, but it cannot be found or
  * turned on, then return -EPROBE_DEFER to ensure that the device is not