rust_binder: avoid name mangling for get_work[_local]

rust_binder: avoid name mangling for get_work[_local]

Currently ps -A shows processes waiting on schedule() in functions with
names such as do_epoll_wait, wait_woken, and the impeccably named
_RNvMs2_NtCs8QPsHWIn21X_16rust_binder_main6threadNtB5_6Thread8get_work.

To improve how ps output looks, give explicit non-mangled names to the
functions where Rust Binder calls schedule(), since these are the most
likely places to show up on ps output.

The name of rust_binder_waitlcl is truncated instead of using _local
suffix because rust_binder_wait_local is sufficiently long that ps shows
unaligned output.

This is intended to be a temporary workaround until we find a better
solution. Adding #[export_name] to every Rust function that calls
schedule() is not a great long-term solution.

Suggested-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Acked-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260219-rust-binder-ps-v2-1-773eca09c125@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>