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These declarations for s3c6400 have been removed since
commit 6bac4f78

 ("ARM: s3c: remove s3c6400 support"), so
remove it.
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Link: https://lore.kernel.org/r/20240813105545.1180788-2-cuigaosheng1@huawei.com
Fixes: 6bac4f78

 ("ARM: s3c: remove s3c6400 support")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>