Add external/libconstrainedcrypto to the Brillo manifest.

Bug: 27287913
Change-Id: I329d92f8b03321ce867f525d2489b6c4ec9c6c49
diff --git a/default.xml b/default.xml
index 6694036..a004dfc 100644
--- a/default.xml
+++ b/default.xml
@@ -80,6 +80,7 @@
   <project path="external/libcap" name="platform/external/libcap" groups="bdk" />
   <project path="external/libcap-ng" name="platform/external/libcap-ng" groups="bdk" />
   <project path="external/libchrome" name="platform/external/libchrome" groups="bdk" />
+  <project path="external/libconstrainedcrypto" name="platform/external/libconstrainedcrypto" groups="bdk" />
   <project path="external/libcxx" name="platform/external/libcxx" groups="bdk" />
   <project path="external/libcxxabi" name="platform/external/libcxxabi" groups="bdk" />
   <project path="external/libdivsufsort" name="platform/external/libdivsufsort" groups="bdk" />