ANDROID: add initial KMI representation and enable KMI enforcement

Add android/abi_gki_aarch64.xml as initial ABI representation of the KMI
and start enforcing KMI. While this is hard enforcement in the code
base, we still allow controlled changes to the ABI until KMI freeze.

Bug: 220181989
Signed-off-by: Matthias Maennich <maennich@google.com>
Change-Id: Icfdc0a05899667db3a45dca2977edce0cde9b600