MAINTAINERS: add Benno Lossin as Rust reviewer

Benno has been involved with the Rust for Linux project for
the better part of a year now. He has been working on solving
the safe pinned initialization problem [1], which resulted in
the pin-init API patch series [2] that allows to reduce the
need for `unsafe` code in the kernel. He is also working on
the field projection RFC for Rust [3] to bring pin-init as
a language feature.

His expertise with the language will be very useful to have
around in the future if Rust grows within the kernel, thus
add him to the `RUST` entry as reviewer.

Link: https://rust-for-linux.com/the-safe-pinned-initialization-problem [1]
Link: https://lore.kernel.org/rust-for-linux/[email protected]/ [2]
Link: rust-lang/rfcs#3318 [3]
Cc: Benno Lossin <[email protected]>
Reviewed-by: Alex Gaynor <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

Author: ojeda

MAINTAINERS

@@ -18238,6 +18238,7 @@ M:	Wedson Almeida Filho <[email protected]>
 R:	Boqun Feng <[email protected]>
 R:	Gary Guo <[email protected]>
 R:	Björn Roy Baron <[email protected]>
+R:	Benno Lossin <[email protected]>
 L:	[email protected]
 S:	Supported
 W:	https://github.com/Rust-for-Linux/linux