UPSTREAM: tty: serial: samsung_tty: remove SERIAL_SAMSUNG_DEBUG

Since a05025d0ce72 ("tty: serial: samsung_tty: use standard debugging
macros") this configuration option is not used at all, so remove it from
the Kconfig file.

Bug: 144661360
Cc: linux-kernel@vger.kernel.org
Cc: linux-serial@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Shinbeom Choi <sbeom.choi@samsung.com>
Cc: HYUN-KI KOO <hyunki00.koo@samsung.com>
Cc: Hyunki Koo <kkoos00@naver.com>
Cc: Donghoon Yu <hoony.yu@samsung.com>
Cc: Kukjin Kim <kgene@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200220102628.3371996-2-gregkh@linuxfoundation.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 3b3845bb6c78760e97f2d50cce5b527a0fc27ff3)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I3712111a3e01e6b8616cf86b58440e8f819229e3