[HDM] Use correct key for caching interfaces - name

Interface cache used the interface itself as a key. However, the
interface object is not constant - it will be created on every query.
Instead use the interface name which is constant.

Bug: 62230725
Test: unit tests, run aware & p2p concurrently
Change-Id: I50f1eaf6c64308742981e4e2bc368a8e219c679c
1 file changed
tree: f71d99ac74776dfcaaed8aa41537a5c2f01b5fdb
  1. service/
  2. PREUPLOAD.cfg