drm/mipi-dbi: Support shadow-plane state

Implement MIPI DBI planes with struct drm_shadow_plane_state, so that the
respective drivers can use the vmap'ed GEM-buffer memory. Implement state
helpers, the {begin,end}_fb_access helpers and wire up everything.

With this commit, MIPI DBI drivers can access the GEM object's memory
that is provided by shadow-plane state. The actual changes to drivers
are implemented separately.

v2:
	* use shadow-plane state directly (Noralf)

Signed-off-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Noralf Trønnes <[email protected]>
Tested-by: Javier Martinez Canillas <[email protected]>
Tested-by: Noralf Trønnes <[email protected]> # drm/tiny/mi0283qt
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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