keymaster: Add kernel dependency

Change-Id: I6ff0b7995ac19d272c088e6210638cdcd48bc4de
diff --git a/Android.mk b/Android.mk
index 19e78f5..219aa32 100644
--- a/Android.mk
+++ b/Android.mk
@@ -32,7 +32,9 @@
         libc \
         libdl
 
-LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
+LOCAL_ADDITIONAL_DEPENDENCIES := \
+    $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr \
+    $(LOCAL_PATH)/Android.mk
 
 LOCAL_MODULE_TAGS := optional