Add external/libbpf

Bug: 203823368
Test: repo sync
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: Ic1000be2a96086e819347552c5d3018f53dbaa54
diff --git a/default.xml b/default.xml
index e1c1d00..b6edd1c 100644
--- a/default.xml
+++ b/default.xml
@@ -289,6 +289,7 @@
   <project path="external/libavc" name="platform/external/libavc" groups="pdk" />
   <project path="external/libbackup" name="platform/external/libbackup" groups="pdk" />
   <project path="external/libbrillo" name="platform/external/libbrillo" groups="pdk" />
+  <project path="external/libbpf" name="platform/external/libbpf" groups="pdk" />
   <project path="external/libcap" name="platform/external/libcap" groups="pdk" />
   <project path="external/libcap-ng" name="platform/external/libcap-ng" groups="pdk" />
   <project path="external/libchrome" name="platform/external/libchrome" groups="pdk" />