Combine aconfig cache files into per-partition dumps.

Bug: 283910439
Test: manual validation of outputs, soong unit tests
Change-Id: I5f7dc16ee42c3722dc66ffe964ed20479eea1e15
diff --git a/core/main.mk b/core/main.mk
index 5a591f9..1adc34f 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -1356,6 +1356,7 @@
   product_host_FILES := $(call host-installed-files,$(INTERNAL_PRODUCT))
   product_target_FILES := $(call product-installed-files, $(INTERNAL_PRODUCT))
   # WARNING: The product_MODULES variable is depended on by external files.
+  # It contains the list of register names that will be installed on the device
   product_MODULES := $(_pif_modules)
 
   # Verify the artifact path requirements made by included products.