Fix incremental builds by adding Cleanspec step

Change-Id: Id06cc40081a5ff33e015b7aeed8fffd73ef09721
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 875f9c8..a73d804 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -52,3 +52,4 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/EXECUTABLES/wpa_supplicant_intermediates)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/EXECUTABLES/wpa_supplicant_intermediates/*)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/EXECUTABLES/wpa_cli_intermediates/*)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/obj/EXECUTABLES/wpa_supplicant_intermediates/*)