UPSTREAM: tty: serial: samsung_tty: fix blank line checkpatch warning

checkpatch is giving a bunch of:
	WARNING: Missing a blank line after declarations
messages on this file, so fix up all instances of that issue.

Bug: 144661360
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/20191210143706.3928480-10-gregkh@linuxfoundation.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 9fe0d41ffd39cb4891b53015433580ff6ecb0444)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Icb1ccdc4c95ca6a5905b70d0aead60b178f1fa7a