Revert "Revert "Create a product variable for skipping apex cont..."

Revert submission 2966055-revert-2964509-skip-apex-contributions-EOKWOFHENC

Reason for revert: The root cause CL has been reverted https://googleplex-android-review.git.corp.google.com/c/platform/vendor/google/build/+/26268799

Reverted changes: /q/submissionid:2966055-revert-2964509-skip-apex-contributions-EOKWOFHENC

Change-Id: I9a40b652d38f1a4a4693e0cdb66cbe48632bafff
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 7d03aa3..843b03c 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -334,6 +334,8 @@
 
 $(call add_json_bool, CheckVendorSeappViolations, $(filter true,$(CHECK_VENDOR_SEAPP_VIOLATIONS)))
 
+$(call add_json_list, BuildIgnoreApexContributionContents, $(sort $(PRODUCT_BUILD_IGNORE_APEX_CONTRIBUTION_CONTENTS)))
+
 $(call add_json_map, PartitionVarsForBazelMigrationOnlyDoNotUse)
   $(call add_json_str,  ProductDirectory,    $(dir $(INTERNAL_PRODUCT)))