Map Rust KeyMint to same SELinux policy as C++

Allow the Rust and C++ implementations of the KeyMint HAL service to be
toggled easily, by mapping them to the same SELinux policy.

Bug: 197891150
Bug: 225036046
Test: VtsAidlKeyMintTargetTest with local changes, TreeHugger
Change-Id: I37f8016240097381410903f0f326dc16fc24db1e
1 file changed