drm/exynos: add pipe param to exynos_drm_crtc_create()

Get the pipe value from a parameter instead of getting it from
manager->pipe. We are removing manager->pipe.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Inki Dae <inki.dae@samsung.com>