drm/fourcc: Document open source user waiver

It's a bit a FAQ, and we really can't claim to be the authoritative
source for allocating these numbers used in many standard extensions
if we tell closed source or vendor stacks in general to go away.

Iirc this was already clarified in some vulkan discussions, but I
can't find that anywhere anymore. At least not in a public link.

Cc: Maarten Lankhorst <[email protected]>
Cc: Maxime Ripard <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Cc: David Airlie <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Daniel Stone <[email protected]>
Cc: Bas Nieuwenhuizen <[email protected]>
Cc: Jason Ekstrand <[email protected]>
Cc: Neil Trevett <[email protected]>
Acked-by: Daniel Stone <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Acked-by: David Airlie <[email protected]>
Acked-by: Marek Olšák <[email protected]>
Acked-by: Bas Nieuwenhuizen <[email protected]>
Acked-by: Jason Ekstrand <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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