MAINTAINERS: rust: add tree field for RUST [ALLOC]

In the Rust subsystem we are starting to add new subentries which will
have their own trees. Those trees will be part of linux-next and will
be sent as PRs to be merged into rust-next.

Thus do the same for the existing subentry we already have: RUST [ALLOC].

Acked-by: Boqun Feng <[email protected]>
Acked-by: Danilo Krummrich <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

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