KeyMint HAL in Rust for Trusty

Implementation of the KeyMint HAL service based on the Rust reference
implementation.

This CL adds the code and associated metadata, but does not included it
into the overall build.

Bug: 197891150
Bug: 225036046
Test: VtsAidlKeyMintTargetTest
Change-Id: I9d95b9d8be645b6299a06d40973b38b66dcf3c07
5 files changed