Use binder to get AIDL descriptor in Rust

Using the binder object we can directly get names of interfaces
rather than hardcoding the strings. This allows for lookup to be easier.

Test: atest keystore2_test and atest CtsKeystoreTestCases
Bug: 249096262
Change-Id: I74bc696b860e2c08286b1d5175378e8d44728858
3 files changed