add kernel/configs to the manifest

Change-Id: I87861ca1f484989b910896edca294f6fb517e9ef

default.xml

@@ -422,6 +422,7 @@
   <project path="hardware/qcom/power" name="platform/hardware/qcom/power" groups="qcom" />
   <project path="hardware/qcom/wlan" name="platform/hardware/qcom/wlan" groups="qcom_wlan" />
   <project path="hardware/ril" name="platform/hardware/ril" groups="pdk" />
+  <project path="kernel/configs" name="kernel/configs" groups="vts,pdk" />
   <project path="kernel/tests" name="kernel/tests" />
   <project path="libcore" name="platform/libcore" groups="pdk" />
   <project path="libnativehelper" name="platform/libnativehelper" groups="pdk" />