Increase intltest timeout to 18 minutes

For some low-end devices, intltest can not be completed in 10 minutes

Bug: 290583665
Test: atest CtsIcu4cTestCases
Change-Id: Ib3f8183e1a3e30b56355908e20a44a8d33c36c7b
(cherry picked from commit ca8283305736dc12c8ebe8878105af137d2b0d20)

Author: yinwei.sun1

tests/tests/icu/CtsIcu4cTestCases.xml

@@ -67,8 +67,8 @@
         <option name="set-option" value="module-name:intltest" />
         <option name="set-option" value="runtime-hint:1m30s" />
         <option name="set-option" value="no-fail-data-errors:true" />
-        <!-- test-timeout unit is ms, value = 10 minutes -->
-        <option name="set-option" value="native-test-timeout:600000" />
+        <!-- test-timeout unit is ms, value = 18 minutes -->
+        <option name="set-option" value="native-test-timeout:1080000" />
         <!-- Sample include-filter to run a subset of tests in utility-->
         <!-- <option name="set-option" value="include-filter:intltest.utility" /> -->
     </test>