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: I93e8f60124a09b4fba4675ac7f128ab553102bf7
diff --git a/android/config.go b/android/config.go
index d94a86f..40497d1 100644
--- a/android/config.go
+++ b/android/config.go
@@ -2015,3 +2015,7 @@
 	}
 	return ret
 }
+
+func (c *config) BuildIgnoreApexContributionContents() []string {
+	return c.productVariables.BuildIgnoreApexContributionContents
+}