kobject: modify kobject_get_path() to take a const *

kobject_get_path() does not modify the kobject passed to it, so make the
pointer constant.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Link: https://lore.kernel.org/r/20221001165315.2690141-1-gregkh@linuxfoundation.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>