rust: Drop obsolete rust-lld and extended tools dependencies

rust: Drop obsolete rust-lld and extended tools dependencies

Some dependencies introduced during the v1.86 upgrade
were needed only for rust-lld and certain LLVM extended tools,
not for the Rust compiler itself.

Since rust-lld and the extended tools are now disabled, these
dependencies have become obsolete. Additionally, related tasks
such as packaging zsh files and removing cargo binaries are no longer relevant.
They can be re-enabled later if needed.

Signed-off-by: Yash Shinde <Yash.Shinde@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>