Keystore 2.0: Start keystore2 daemon conditionally.

This patch makes the keystore2 daemon start conditionally based on the
platform property ro.android.system.keystore2.enable.
This is patch can be reverted when the Keystore 2.0 migration is
complete. b/171563717

Bug: 171563717
Bug: 171305684
Test: The keystore2 daemon is running if the property
      ro.android.system.keystore2.enable is set and true
      and not running otherwise.
Change-Id: I2b3d6c70f45f3dafb9edb6f2f6960be94e13ed20
1 file changed