Add a task to update temperature values in LPC mapped value space every
second. Also modify ectool to read directly from LPC mapped space.
Signed-off-by: Vic Yang <victoryang@chromium.org>
BUG=chrome-os-partner:8065
TEST="ectool temps" gives same result as "temps" from ec console.
Change-Id: Idcdef8d822724f9bd22d7e819c717cba5af5eb77