Add device/google/contexthub

BUG:26545959
Change-Id: Ifc0e0bd1d0577b485d59ea6ea9ec43a5cd5316c0

default.xml

@@ -52,6 +52,7 @@
   <project path="device/google/accessory/arduino" name="device/google/accessory/arduino" groups="device" />
   <project path="device/google/accessory/demokit" name="device/google/accessory/demokit" groups="device" />
   <project path="device/google/atv" name="device/google/atv" groups="device,fugu,broadcom_pdk,generic_fs" />
+  <project path="device/google/contexthub" name="device/google/contexthub" groups="device" />
   <project path="device/htc/flounder" name="device/htc/flounder" groups="device,flounder,broadcom_pdk" />
   <project path="device/htc/flounder-kernel" name="device/htc/flounder-kernel" groups="device,flounder,broadcom_pdk" clone-depth="1" />
   <project path="device/huawei/angler" name="device/huawei/angler" groups="device,angler,broadcom_pdk" />