Implement RecoverableKeyStore API to set/get recovery secret types.

Bug: 66499222
Test: adb shell am instrument -w -e package \
com.android.server.locksettings.recoverablekeystore \
com.android.frameworks.servicestests/android.support.test.runner.AndroidJUnitRunner

Change-Id: If29f22f24438a9d050fabebf970b9ae56b0df805
6 files changed