Implement getInterfaceHash/Version (omapi)

As these interfaces get frozen for TM, 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: I274f847ed8156acd0c4b288e306fcab2d380bcd5