Add external/arm-optimized-routines.

Bug: http://b/111600065
Test: N/A
Change-Id: Iaf16c125dfc0a6dacd562858d0fb11cde1b9c0e3

default.xml

@@ -90,6 +90,7 @@
   <project path="external/apache-xml" name="platform/external/apache-xml" groups="pdk" />
   <project path="external/archive-patcher" name="platform/external/archive-patcher" groups="pdk" />
   <project path="external/arm-neon-tests" name="platform/external/arm-neon-tests" groups="vendor" />
+  <project path="external/arm-optimized-routines" name="platform/external/arm-optimized-routines" groups="pdk" />
   <project path="external/autotest" name="platform/external/autotest" groups="pdk-fs" />
   <project path="external/avb" name="platform/external/avb" groups="pdk" />
   <project path="external/bart" name="platform/external/bart" groups="pdk" />