[sun4i_csi] Add "debug" parameter to all csi and camera drivers.
[sun4i-csi] In camera sub-drivers get GPIO configuration from platform
data.

Signed-off-by: Anatoliy Sokolov <aesok@post.ru>
[sun4-csi] Cleanup GPIO code in csi drivers.

Signed-off-by: Anatoliy Sokolov <aesok@post.ru>