ARM: SAMSUNG: fix __init attribute on regarding s3c_set_platdata()

s3c_set_platdata() is defined with __init attribute, hence all functions
referencing this function should also be defined with __init attribute.

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>