driver-core: skip uevent generation when nobody is listening

Most network namespaces unlikely have listeners to uevents, and should
benefit from skipping all the string copies.
lowmemorykiller: use version from grouper
lowmemorykiller: tag log messages
cpuquiet: dont force LP mode switch
leds: more cleanup
patch: another round of log spilling cleanup
usb: remove most of that HTC logging shizz