rust: make statspull_bindgen visible to "//packages/modules"

New statslog rust libraries depend on libstatspull_bindgen.

For example, libstatslog_dns_resolver_rust will start depending on
statspull_bindgen by aosp/3467325.

Bug: 392816523
Test: m

Change-Id: Ib3130f5d5efcd7085140880dd79da49db2f21b60