Temporarily whitelist system_server->storage denials

Make presubmit less flaky.

Bug: 145267097
Test: build
Change-Id: I45dd2f03a5db98fa70c950378538d32eb97a44df
diff --git a/private/bug_map b/private/bug_map
index c6c8278..60c2f15 100644
--- a/private/bug_map
+++ b/private/bug_map
@@ -27,6 +27,7 @@
 system_server crash_dump process b/73128755
 system_server overlayfs_file file b/142390309
 system_server sdcardfs file b/77856826
+system_server storage_stub_file dir b/145267097
 system_server zygote process b/77856826
 vold system_data_file file b/124108085
 zygote untrusted_app_25 process b/77925912