hostsidetests/devicepolicy/app/DeviceAndProfileOwner/res/xml/network_security_config.xml

<?xml version="1.0" encoding="utf-8"?>
<network-security-config>
  <base-config>
    <trust-anchors>
      <certificates src="user" />
    </trust-anchors>
  </base-config>
</network-security-config>