drm/plane: Allocate planes with drm_universal_plane_alloc()

Provide drm_univeral_plane_alloc() to allocate and initialize a
plane. Code for non-atomic drivers uses this pattern. Convert them to
the new function. The modeset helpers contain a quirk for handling their
color formats differently. Set the flag outside plane allocation.

The new function is already deprecated to some extend. Drivers should
rather use drmm_univeral_plane_alloc() or drm_universal_plane_init().

v2:
	* kerneldoc fixes (Javier)
	* grammar fixes in commit message

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Lyude Paul <[email protected]> # nouveau
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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