MAINTAINERS: Add drm-rust tree for Rust DRM drivers and infrastructure

Multiple DRM Rust drivers (e.g. nova-core, nova-drm, Tyr, rvkms) are in
development, with at least Nova and (soon) Tyr already upstream. Having a
shared tree will ease and accelerate development, since all drivers can
consume new infrastructure in the same release cycle.

This includes infrastructure shared with other subsystem trees (e.g. Rust
or driver-core). By consolidating in drm-rust, we avoid adding extra
burden to drm-misc maintainers, e.g. dealing with cross-tree topic
branches.

The drm-misc tree is not a good fit for this stage of development, since
its documented scope is small drivers with occasional large series.

Rust drivers in development upstream, however, regularly involve large
patch series, new infrastructure, and shared topic branches, which may
not align well with drm-misc at this stage.

The drm-rust tree may not be a permanent solution. Once the core Rust,
DRM, and KMS infrastructure have stabilized, drivers and infrastructure
changes are expected to transition into drm-misc or standalone driver
trees respectively. Until then, drm-rust provides a dedicated place to
coordinate development without disrupting existing workflows too much.

Cc: David Airlie <[email protected]>
Cc: Simona Vetter <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Thomas Zimmermann <[email protected]>
Signed-off-by: Danilo Krummrich <[email protected]>
Acked-by: Janne Grunau <[email protected]>
Acked-by: Maxime Ripard <[email protected]>
Acked-by: Alexandre Courbot <[email protected]>
Acked-by: Jani Nikula <[email protected]>
Acked-by: Daniel Almeida <[email protected]>
Acked-by: Alice Ryhl <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alice Ryhl <[email protected]>

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