Add bouncycastle to the pdk group

Change-Id: If89ac5135b0155199f2828cc12e6409bf86eabb2

default.xml

@@ -63,7 +63,7 @@
   <project path="external/bison" name="platform/external/bison" groups="pdk" />
   <project path="external/blktrace" name="platform/external/blktrace" />
   <project path="external/bluetooth/bluedroid" name="platform/external/bluetooth/bluedroid" groups="pdk" />
-  <project path="external/bouncycastle" name="platform/external/bouncycastle" />
+  <project path="external/bouncycastle" name="platform/external/bouncycastle" groups="pdk" />
   <project path="external/bsdiff" name="platform/external/bsdiff" groups="pdk" />
   <project path="external/bzip2" name="platform/external/bzip2" groups="pdk" />
   <project path="external/ceres-solver" name="platform/external/ceres-solver" />