Move SystemUI and its permissions to /product

Since this app is frequently customized by OEMs, it doesn't
fit in the mainline /system image right now. Move it to
/product.

Bug: 110072687
Test: make
Test: boot blueline
Test: atest SystemUITests
Change-Id: If27bcccd62f239f716db5ee7f4f1418d936e1cf4
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 478e4fe..d01e183 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -251,6 +251,7 @@
 $(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 $(PRODUCT_OUT)/vendor/overlay/ExperimentNavigationBarSlim)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/priv-app/SystemUI)
 # ******************************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST ABOVE THIS BANNER
 # ******************************************************************