MAINTAINERS: Move Sangbeom Kim to credits

Sangbeom Kim upstreamed the Samsung SoC Sound and PMIC (MFD, regulator,
RTC) drivers.  However his contributions and LKML activity ends in 2014:
https://lore.kernel.org/lkml/?q=f%3A%22Sangbeom+Kim%22

Move Sangbeom Kim to the CREDITS file.  Thank you for the effort you put
in to the upstream Samsung support.

Link: https://lore.kernel.org/r/20201016061848.6258-2-krzk@kernel.org
Cc: Sangbeom Kim <sbkim73@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

CREDITS

@@ -1914,6 +1914,11 @@ N: Kukjin Kim
 E: kgene@kernel.org
 D: Samsung S3C, S5P and Exynos ARM architectures
 
+N: Sangbeom Kim
+E: sbkim73@samsung.com
+D: Samsung SoC Audio (ASoC) drivers
+D: Samsung PMIC (RTC, regulators, MFD) drivers
+
 N: Russell King
 E: rmk@arm.linux.org.uk
 D: Linux/arm integrator, maintainer & hacker

MAINTAINERS

@@ -15368,7 +15368,6 @@ F:	security/safesetid/
 
 SAMSUNG AUDIO (ASoC) DRIVERS
 M:	Krzysztof Kozlowski <krzk@kernel.org>
-M:	Sangbeom Kim <sbkim73@samsung.com>
 M:	Sylwester Nawrocki <s.nawrocki@samsung.com>
 L:	alsa-devel@alsa-project.org (moderated for non-subscribers)
 S:	Supported
@@ -15403,7 +15402,6 @@ S:	Maintained
 F:	drivers/platform/x86/samsung-laptop.c
 
 SAMSUNG MULTIFUNCTION PMIC DEVICE DRIVERS
-M:	Sangbeom Kim <sbkim73@samsung.com>
 M:	Krzysztof Kozlowski <krzk@kernel.org>
 M:	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
 L:	linux-kernel@vger.kernel.org