MAINTAINERS: ASoC: samsung: Add Sylwester Nawrocki and Krzysztof Kozlowski

Extend maintainer entry for Samsung SoC sound drivers with Krzysztof
Kozlowski and Sylwester Nawrocki. The file pattern is duplicated in main
Exynos ARM section so remove it from there.

Cc: Kukjin Kim <kgene@kernel.org>
Cc: Sangbeom Kim <sbkim73@samsung.com>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: alsa-devel@alsa-project.org
Cc: linux-samsung-soc@vger.kernel.org
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>