perfstatsd: replace LOG_TO() macros with LOG()

perfstatsd always writes to the SYSTEM log, so instead of using
LOG_TO(), it can use the normal LOG() macros as long as it calls
InitLogging() with a default to the SYSTEM log.

Test: perfstatsd writes to the SYSTEM log still
Change-Id: Ib15867589c0b5679cc14f9fe8694ef48fc0e599e
5 files changed