update OAT.xml.

Signed-off-by: Nduangavin123 <duanxichao@huawei.com>

OAT.xml

@@ -25,6 +25,7 @@
                 <!--policyitem type="compatibility" name="GPL-2.0+" path="abc/.*" desc="Process that runs independently, invoked by the X process."/-->
                 <!--policyitem type="license" name="LGPL" path="abc/.*" desc="Dynamically linked by module X"/-->
                 <!--policyitem type="copyright" name="xxx" path="abc/.*" rule="may" group="defaultGroup" filefilter="copyrightPolicyFilter" desc="Developed by X Company"/-->
+                <policyitem type="license" name="CC-BY-4.0" path=".*" rule="may" group="defaultGroup" filefilter="defaultPolicyFilter" desc="License for documents"/>
             </policy>
         </policylist>
         <filefilterlist>