Rename the poorly named ALL_PRODUCTS variable.

There was PRODUCTS, ALL_PRODUCTS and really_all_products, and
ALL_PRODUCTS was in fact not all products. Rename it to what
it really is: parent makefiles, i.e. product makefiles that include
other product makefiles.

Also rename the really_all_products var.

Bug: 80410283
Test: lunch aosp_arm64; m product-graph
Change-Id: I87aec49966e50c364ca2baf5de10fe30f9292a53
diff --git a/core/product-graph.mk b/core/product-graph.mk
index 576d14d..4133bd9 100644
--- a/core/product-graph.mk
+++ b/core/product-graph.mk
@@ -18,7 +18,7 @@
 define gather-all-products
 $(sort $(foreach p, \
 	$(eval _all_products_visited := )
-  $(call all-products-inner, $(ALL_PRODUCTS)) \
+  $(call all-products-inner, $(PARENT_PRODUCT_FILES)) \
 	, $(if $(strip $(p)),$(strip $(p)),)) \
 )
 endef
@@ -49,7 +49,7 @@
 endif
 endif
 
-really_all_products := $(call gather-all-products)
+all_products := $(call gather-all-products)
 
 open_parethesis := (
 close_parenthesis := )
@@ -66,7 +66,7 @@
 
 endef
 
-$(products_graph): PRIVATE_PRODUCTS := $(really_all_products)
+$(products_graph): PRIVATE_PRODUCTS := $(all_products)
 $(products_graph): PRIVATE_PRODUCTS_FILTER := $(products_list)
 
 $(products_graph): $(this_makefile)
@@ -130,7 +130,7 @@
 endef
 
 product_debug_files:=
-$(foreach p,$(really_all_products), \
+$(foreach p,$(all_products), \
 			$(eval $(call transform-product-debug, $(p))) \
 			$(eval product_debug_files += $(call product-debug-filename, $(p))) \
    )