Add getHashChain() to IBase.

Each interface has a getHashChain() method that
returns the hash of all .hal files from the rtti
of the interface up to IBase.

Test: pass (since no frozen hashes for interfaces yet)
Bug: 36602587
Change-Id: I068cc7a09fea1fdab050b3b7e5b3d4360bd56cdc
1 file changed