BpfLoader-rs: add rustfmt.toml symlink am: 7802654ecf am: 6f4cfec8a8

Original change: https://android-review.googlesource.com/c/platform/system/bpf/+/3345551

Change-Id: Ibd80689ac47d59ca9afc66228a8a1dbcbf410dbd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>