Implement getInterfaceHash/Version (CHRE)

As these interfaces get frozen, java services
implementing the interfaces are required to implement getInterfaceHash
and getInterfaceVersion [1]

[1]
https://source.android.com/devices/architecture/aidl/stable-aidl#new-meta-interface-methods

Bug: 190577319
Test: m
Change-Id: I009330ca16d68593f26785e81afb11d7752b0c20