drm/simple-helpers: Always add planes to the state update

Our update function is hooked to the single plane, which might not get
called for crtc-only updates. Which is surprising, so fix this by
always adding the plane.

While at it document how&when the event should be sent out better in
the kerneldoc.

Cc: Noralf Trønnes <[email protected]>
Cc: [email protected]
Tested-and-Reported-by: [email protected]
Signed-off-by: Daniel Vetter <[email protected]>
Reviewed-by: Noralf Trønnes <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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