ARM: EXYNOS: Add __init attribute to nuri_camera_init()

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

nuri_camera_init() is referenced only in '__init nuri_machine_init()', thus
this change won't put any additional constraint on the usage of
nuri_camera_init().

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