firmware: move firmware_class from Documentation/ to samples/

Move the firmware_class sample drivers to samples/ so that they are
buildable and can be maintained.
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Acked-by: NMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>

Documentation/firmware_class/firmware_sample_firmware_class.c → samples/firmware_class/firmware_sample_firmware_class.c

@@ -202,6 +202,6 @@ static void __exit firmware_sample_exit(void)
 	kfree(fw_priv);
 	kfree(class_dev);
 }
+
 module_init(firmware_sample_init);
 module_exit(firmware_sample_exit);
-