roll: pigweed android: Add Soong build rules for Pigweed Rust libraries

Add rust_library build rules for Pigweed Rust crates (pw_status, pw_bytes,
pw_varint, pw_stream, pw_base64, pw_format, pw_tokenizer) in their respective
Android.bp files so Soong can compile and link them for Android targets.
Use cfg guards (proc_macro) in pw_format and pw_tokenizer so Android
target compilation avoids host proc-macro dependencies while preserving 100%
compatibility with Bazel/GN build rules.

Original-Fixes: 528354792
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/430572
Original-Revision: 32dc81ba49ad8bf73ebd734e5ee4d2d95002d8c2

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: ee085039eb66a5..32dc81ba49ad8b
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8676621974977365777
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Iaaf055197f076a60268b973397190c43f9a0d86f
Reviewed-on: https://pigweed-review.googlesource.com/c/zephyr/zephyr-bazel/+/434672