Use defaults to reference current keystore AIDL

The KeyMint HAL will soon be updated for a new version, which will in
turn induce a version bump for the keystore2 AIDL interface. To make
this process easier, add cc_defaults that references the "current"
version, and use this elsewhere. This should hopefully mean that a
future version bump only needs to happen in the defaults.

Test: TreeHugger
Change-Id: I8999de92443fd121a9515dccde8d76094dc93023
3 files changed