Revert "AndroidKeyStore: return error code on error"

This reverts commit e66769ad5194cb4533d1087416a2e804ac384285.
Revert "AndroidKeyStore: fix tests"

This reverts commit 8b58c52bf4cc276165b1857eb4087eabde7b6477.
Revert "Switch keystore to binder"

This reverts commit 6b77645aa9ac51ce33ea67adba226aaf1a6e8846.