Rename modulesAddedWall to modulesWarningsAllowed

MODULES_ADDED_WALL is deceiving and it actually meant which modules are
allowed to have warnings (do not automatically append -Werror flag).

Test: presubmit
Bug: 233183337
Change-Id: Ia2eb972d3d76ba245840f9872cbcc66d2894dab3
diff --git a/core/Makefile b/core/Makefile
index 9b7bbe7..75269a1 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -694,8 +694,8 @@
 	@rm -f $@
 	echo "# Modules using -Wno-error" >> $@
 	for m in $(sort $(SOONG_MODULES_USING_WNO_ERROR) $(MODULES_USING_WNO_ERROR)); do echo $$m >> $@; done
-	echo "# Modules added default -Wall" >> $@
-	for m in $(sort $(SOONG_MODULES_ADDED_WALL) $(MODULES_ADDED_WALL)); do echo $$m >> $@; done
+	echo "# Modules that allow warnings" >> $@
+	for m in $(sort $(SOONG_MODULES_WARNINGS_ALLOWED) $(MODULES_WARNINGS_ALLOWED)); do echo $$m >> $@; done
 
 $(call declare-0p-target,$(WALL_WERROR))