drm: imx: remove struct imx_drm_crtc and imx_drm_crtc_helper_funcs

With the vblank hooks in struct drm_crtc_funcs, we do not need to
maintain the CRTC specific vblank callbacks with struct
imx_drm_crtc_helper_funcs any more.  By moving the stuff that we
currently do in imx_drm_add_crtc(), like of_node setting and
drm_crtc_helper_add()/drm_crtc_init_with_planes() invoking, we can kill
things like struct imx_drm_crtc, imx_drm_crtc_helper_funcs and related
functions completely.

Functions ipu_enable_vblank() and ipu_disable_vblank() are moved around
without changes, only for saving the forward declarations.

Signed-off-by: Shawn Guo <[email protected]>
Cc: Philipp Zabel <[email protected]>
Acked-by: Philipp Zabel <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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