Revert "logd: liblog: whitelist "snet_event_log""

Callers will not guarantee that they can or will ratelimit, we need to
retain the ability to blacklist snet_event_log as a result.

This reverts commit 6aa21b22.

Bug: 26178938
Change-Id: Ibf47d2e23a84c56f5f72d02312c698df7ff2b601