Update git submodules

* Update prebuilts/rust from branch 'master'
  to 3cebe0166d7ae8445e80fecb3fb6985cbe9d5482
  - Make `rustfmt` available for other modules
    
    Using `cc_prebuilt_binary` works fine, it doesn’t actually care if the
    binary is written in C++ of Rust.
    
    Test: makes https://r.android.com/2094185 work
    Change-Id: I4d08a8fd7f3794e77aa34b8c5ade6aaf08d720a1
    
1 file changed