Merge changes from topic "ja/rxtx_protect"

* changes:
  test(memory share): hypervisor retrieve request fails
  test(memory share): relinquish fails if TX is in realm
  test(memory share): hypervisor's RX is realm on retrieve
  test(memory share): hypervisor's TX is realm on retrieve
  test(memory share): retrieve request from VM
  test(memory share): make TX buffer realm