Revert: "logd: default off by-UID spam filter"

With "logd: inject first UID by log buffer message" we can
remove the FUD introduced by having the UID spam filter on

This reverts commit 4141cb23

Bug: 19608965
Bug: 14469172
Change-Id: Ifdc20b099e0e426546525b11c1dfe8cc0f830a02