Documentation/gpu: Add an explanation about the DCN pipeline

In the DCN code, we constantly talk about hardware pipeline, pipeline,
or even just pipes, which is a concept that is not obvious to everyone.
For this reason, this commit expands the DCN overview explanation by
adding a new section that describes what a pipeline is from the DCN
perspective.

Changes since V1:
- Rewrite the first paragraph that describes AMD hardware pipeline.

Cc: Harry Wentland <[email protected]>
Cc: Nicholas Kazlauskas <[email protected]>
Cc: Bhawanpreet Lakha <[email protected]>
Cc: Hersen Wu <[email protected]>
Cc: Alex Hung <[email protected]>
Cc: Pierre-Eric Pelloux-Prayer <[email protected]>
Cc: Leo Li <[email protected]>
Cc: Simon Ser <[email protected]>
Cc: Pekka Paalanen <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Mark Yacoub <[email protected]>
Cc: Pierre-Loup <[email protected]>
Cc: Michel Dänzer <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Rodrigo Siqueira <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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