drm: Update todo.rst

- drmP.h is now fully split up.
- vkms is happening (and will gain its own todo and docs under a new
  vkms.rst file real soon)
- legacy cruft is completely hidden now, drm_vblank.c is split out
  from drm_irq.c now. I've decided to drop the task to split out
  drm_legacy.ko, partially because Dave already rejected a patch to
  hide the old dri1 drivers better. Current state feels good enough to
  me.
- best_encoder atomic cleanup is done (it's now the default, not even
  exported anymore)
- bunch of smaller things

v2:
- Explain why the drm_legacy.ko task is dropped (Emil).
- typos (Sam).

v3: Fix typo (Ilia)

Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Heiko Stuebner <[email protected]>
Cc: Ilia Mirkin <[email protected]>
Cc: Sam Ravnborg <[email protected]>
Cc: Emil Velikov <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Gustavo Padovan <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: David Airlie <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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