drm/todo: Add entry about implementing buffer age for damage tracking

Currently, only damage tracking for frame damage is supported. If a driver
needs to do buffer damage (e.g: the framebuffer attached to plane's state
has changed since the last page-flip), the damage helpers just fallback to
a full plane update.

Add en entry in the TODO about implementing buffer age or any other damage
accumulation algorithm for buffer damage handling.

Suggested-by: Simon Ser <[email protected]>
Signed-off-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Simon Ser <[email protected]>
Reviewed-by: Thomas Zimmermann <[email protected]>
Reviewed-by: Zack Rusin <[email protected]>
Acked-by: Sima Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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