media: fimc-lite: constify several pointers in function arguments

Several functions do not modify pointed structure, thus the pointer can
point to const data for additional safety and self-documenting intention
of the function.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

media: platform: rename exynos4-is/ to samsung/exynos4-is/

As the end goal is to have platform drivers split by vendor,
rename exynos4-is/ to samsung/exynos4-is/.

Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>