rust: macros: enable the rest of the tests

Now that the rusttest target for the macros crate is compiled with the
kernel crate as a dependency, the rest of the rustdoc tests can be
enabled.

Signed-off-by: Ethan D. Twardy <[email protected]>
Reviewed-by: Alice Ryhl <[email protected]>
Link: https://github.com/Rust-for-Linux/linux/issues/1076
Link: https://lore.kernel.org/r/[email protected]
[ Rebased (use `K{Box,Vec}` instead, enable `lint_reasons` feature).
  Remove unneeded `rust` as language in examples, as well as
  `#[macro_use]` `extern`s. - Miguel ]
Signed-off-by: Miguel Ojeda <[email protected]>

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