Add external/puffin.

Bug: 69061459
Test: repo sync
Merged-In: Ie71397c8c5269d2dfdc495bbcb4383b2a8dba63a
Change-Id: Ie71397c8c5269d2dfdc495bbcb4383b2a8dba63a
(cherry picked from commit 657520445a0e98d51cbb1aa819f6eab7777e2e08)

default.xml

@@ -294,6 +294,7 @@
   <project path="external/ppp" name="platform/external/ppp" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/proguard" name="platform/external/proguard" groups="pdk" />
   <project path="external/protobuf" name="platform/external/protobuf" groups="pdk" />
+  <project path="external/puffin" name="platform/external/puffin" groups="pdk" />
   <project path="external/python/cpython2" name="platform/external/python/cpython2" groups="pdk" />
   <project path="external/python/cpython3" name="platform/external/python/cpython3" groups="pdk" />
   <project path="external/regex-re2" name="platform/external/regex-re2" groups="pdk-cw-fs,pdk-fs" />