laptop-mode-tools: only log VERBOSE msgs to syslog when DEBUG is enabled

VERBOSE msgs are almost universally useless but were being sent through
syslog where they were being tossed with our default config.  This
resulted in >600 context switches to just drop the log msgs.  Avoid
this overhead by making them condition on DEBUG.

TEST=sh -x /usr/sbin/laptop_mode auto force and notice tons of logger calls

Review URL:

Change-Id: I29357115a75a0ed1dab921c10e99403fc9163429
1 file changed