More options to mix floating and nav bar height overlays (1/2)

Before slim buttons and floating were mutually exclusive, now they can
both be enabled as overlays so floating with a slim nav height can
occur.

Bug: 112934365
Test: manual
Change-Id: Ic6b3e1216e5395e71c72391f893182e263188572
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 6deda0c..478e4fe 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -248,6 +248,9 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/framework/com.android.location.provider.jar)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/framework/com.android.future.usb.accessory.jar)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/framework/com.android.media.remotedisplay.jar)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/overlay/ExperimentNavigationBarSlim)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/vendor/overlay/ExperimentNavigationBarSlim)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/vendor/overlay/ExperimentNavigationBarSlim)
 # ******************************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST ABOVE THIS BANNER
 # ******************************************************************