Merge changes Idb6f32f6,Ia95f0e27,Id3bb4a26 into lts-v2.8

* changes:
  fix(cpus): workaround for Cortex-A520 erratum 2630792
  fix(cpus): workaround for Cortex-X2 erratum 2778471
  fix(cpus): workaround for Cortex-A710 erratum 2778471