Documentation/gpu: Add Multiplane Overlay doc

Multiple plane overlay is a feature supported by AMD hardware, but it
has specific details that deserve proper documentation. This commit
introduces a documentation that describes some of the features,
limitations, and use cases for this feature. Part of this documentation
came from some discussion in the public upstream [1][2].

[1]. https://lore.kernel.org/amd-gfx/3qY-QeukF_Q_MJeIXAuBjO4szbS4jRtqkTifXnbnN3bp88SxVodFQRpah3mIIVJq24DUkF6g0rOGdCmSqTvVxx9LCGEItmzLw8uWU44jtXE=@emersion.fr/
[2]. https://lore.kernel.org/amd-gfx/[email protected]/

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: Simon Ser <[email protected]>
Cc: Pekka Paalanen <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Mark Yacoub <[email protected]>
Cc: Leo Li <[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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