fixed e9cb0a0f from https://gitee.com/caoruihong/third_party_NuttX/pulls/68

chore: update OAT.xml
Signed-off-by: NCaoruihong <crh.cao@huawei.com>
Change-Id: Ib6bc060da04cf8c13b12f06d40eee6968d130e07

OAT.xml

@@ -22,6 +22,7 @@
         <licensefile>COPYING</licensefile>
         <policylist>
             <policy name="projectPolicy" desc="">
+                <policyitem type="compatibility" name="MIT" path="COPYING" desc="LICENSE FILE"/>
                 <policyitem type="compatibility" name="InvalidLicense" path="fs/driver/fs_findblockdriver.c" desc="BSD-3-CLAUSE LICENSE"/>
                 <policyitem type="compatibility" name="InvalidLicense" path="fs/driver/fs_openblockdriver.c" desc="BSD-3-CLAUSE LICENSE"/>
                 <policyitem type="compatibility" name="InvalidLicense" path="fs/driver/fs_closeblockdriver.c" desc="BSD-3-CLAUSE LICENSE"/>