tty: serial: samsung.h: fix up minor comment issues

checkpatch found some minor issues with comments in samsung.h, so fix
that up.

Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Hyunki Koo <kkoos00@naver.com>
Cc: HYUN-KI KOO <hyunki00.koo@samsung.com>
Cc: Shinbeom Choi <sbeom.choi@samsung.com>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-serial@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Link: https://lore.kernel.org/r/20191210143706.3928480-3-gregkh@linuxfoundation.orgSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/samsung.h

-// SPDX-License-Identifier: GPL-2.0
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __SAMSUNG_H
 #define __SAMSUNG_H
 
@@ -7,7 +7,7 @@
  *
  * Ben Dooks, Copyright (c) 2003-2008 Simtec Electronics
  *	http://armlinux.simtec.co.uk/
-*/
+ */
 
 #include <linux/dmaengine.h>