Added external/caliper project

Change-Id: I9bcbe1aff3198b3e130e7f3384d58fdcc8bf1344

default.xml

@@ -81,6 +81,7 @@
   <project path="external/bsdiff" name="platform/external/bsdiff" groups="pdk" />
   <project path="external/bzip2" name="platform/external/bzip2" groups="pdk" />
   <project path="external/c-ares" name="platform/external/c-ares" />
+  <project path="external/caliper" name="platform/external/caliper" />
   <project path="external/cblas" name="platform/external/cblas" groups="pdk" />
   <project path="external/ceres-solver" name="platform/external/ceres-solver" groups="pdk-cw-fs,pdk-fs" />
   <project path="external/chromium-libpac" name="platform/external/chromium-libpac" groups="pdk-fs" />