Move webview to /product

This app is frequently overriden by proprietary apps
on shipping devices, so move it to /product.

Bug: 122353713
Test: launch 3p licenses in settings on aosp_arm64 emulator
Change-Id: Ief815cff19e89d687884ab804c4aa874f378b962
diff --git a/CleanSpec.mk b/CleanSpec.mk
index 9c16618..6e9f5aa 100644
--- a/CleanSpec.mk
+++ b/CleanSpec.mk
@@ -46,6 +46,7 @@
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib/libwebviewchromium.so)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/lib64/libwebviewchromium.so)
 $(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/webview)
+$(call add-clean-step, rm -rf $(PRODUCT_OUT)/system/app/webview)
 
 # ******************************************************************
 # NEWER CLEAN STEPS MUST BE AT THE END OF THE LIST ABOVE THIS BANNER