Use the same VaultParams encoding as the server side

Change-Id: I99887f2e52c24726b40fa4cfedc0a1854490160f
Test: adb shell am instrument -w -e package
com.android.server.locksettings.recoverablekeystore
com.android.frameworks.servicestests/android.support.test.runner.AndroidJUnitRunner
2 files changed