Floss: fix |bluetooth/log.h| build issues for linux

aosp/2953903 made a refactor about the logs while some of the linux
components that weren't built by the time.

This CL fixes some minor issues to allow the build.

Bug: 314227872
Test: m Bluetooth
Flag: EXEMPT floss only changes
Change-Id: Ice19f179e29b8f232539b7ed0938a5996eee5851