UPSTREAM: tty: serial: samsung: allow driver to be built by anyone

There is no need to tie this driver to only the Exynos platform,
especially for build testing.  So add COMPILE_TEST as an option allowing
it to be built on any platform.

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/20191210143706.3928480-1-gregkh@linuxfoundation.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit b87671f17c3e94e80b802904d80b6ed213ac70ae)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I208292190438aadd3b32b9f0e70a16d8cdbcc4ce