UPSTREAM: tty: serial: samsung_tty: use standard debugging macros

The dbg() macro for the driver is not needed at all, all drivers should
use the common dynamic debugging infrastructure, not roll their own.  So
delete the custom macro and convert the driver to use dev_dbg() instead,
providing a lot more information than the previous macro provided.

Bug: 144661360
Cc: Kukjin Kim <kgene@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
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20191210143706.3928480-7-gregkh@linuxfoundation.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit a05025d0ce726efca52963044a055aef54c324bb)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ib883e113cbd86cb1f2d96012b556106b1c2b2c84