Add platform/external/epid-sdk.

Bug: 111763812
Test: repo sync

default.xml

@@ -134,6 +134,7 @@
   <project path="external/eigen" name="platform/external/eigen" groups="pdk" />
   <project path="external/elfutils" name="platform/external/elfutils" groups="pdk" />
   <project path="external/emma" name="platform/external/emma" groups="pdk" />
+  <project path="external/epid-sdk" name="platform/external/epid-sdk" groups="pdk" />
   <project path="external/error_prone" name="platform/external/error_prone" groups="pdk" />
   <project path="external/esd" name="platform/external/esd" groups="pdk" />
   <project path="external/expat" name="platform/external/expat" groups="pdk" />