media: MAINTAINERS: Remove Kyungmin from the maintainers list of videobuf2

According to [1], there has been no email posted from him to the
linux-media mailing list since Feb 2013.

Note: The linked archive seems to lack messages newer than the middle of
2019, but it is the only archive that offers search by name. A manual
look through the messages after that time confirms the observation.

[1] https://www.mail-archive.com/search?a=1&l=linux-media%40vger.kernel.org&haswords=&x=7&y=20&from=Kyungmin+Park&subject=&datewithin=1d&date=&notwords=&o=newestSigned-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

MAINTAINERS

@@ -18300,7 +18300,6 @@ VIDEOBUF2 FRAMEWORK
 M:	Tomasz Figa <tfiga@chromium.org>
 M:	Pawel Osciak <pawel@osciak.com>
 M:	Marek Szyprowski <m.szyprowski@samsung.com>
-M:	Kyungmin Park <kyungmin.park@samsung.com>
 L:	linux-media@vger.kernel.org
 S:	Maintained
 F:	drivers/media/common/videobuf2/*