Export error reporting function to allow using it in other packages.

Test: lunch aosp_cf_x86_phone-userdebug && m
Change-Id: I3a1d936ac57966b2f47cb1d9a56e0f96f47b807d
diff --git a/android/config.go b/android/config.go
index a1e97c9..13e55bc 100644
--- a/android/config.go
+++ b/android/config.go
@@ -1393,7 +1393,7 @@
 	if len(pair) == 2 {
 		return pair[0], pair[1]
 	} else {
-		reportPathErrorf(ctx, "malformed (apex, jar) pair: '%s', expected format: <apex>:<jar>", str)
+		ReportPathErrorf(ctx, "malformed (apex, jar) pair: '%s', expected format: <apex>:<jar>", str)
 		return "error-apex", "error-jar"
 	}
 }