drm/rcar-du: Use GEM CMA object functions

Create GEM objects with drm_gem_cma_create_object_default_funcs(), which
allocates the object and sets CMA's default object functions. Corresponding
callbacks in struct drm_driver are cleared. No functional changes are made.

Driver and object-function instances use the same callback functions, with
the exception of vunmap. The implementation of vunmap is empty and left out
in CMA's default object functions.

v3:
	* convert to DRIVER_OPS macro in a separate patch

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Emil Velikov <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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