Add platform/external/dbus

Bug: 22328216

default.xml

@@ -111,6 +111,7 @@
   <project path="external/cmockery" name="platform/external/cmockery" />
   <project path="external/compiler-rt" name="platform/external/compiler-rt" groups="pdk" />
   <project path="external/conscrypt" name="platform/external/conscrypt" groups="pdk-cw-fs" />
+  <project path="external/dbus" name="platform/external/dbus" />
   <project path="external/deqp" name="platform/external/deqp" />
   <project path="external/dexmaker" name="platform/external/dexmaker" groups="pdk-cw-fs" />
   <project path="external/dhcpcd" name="platform/external/dhcpcd" groups="pdk-cw-fs" />