Each TMP006 temperature sensor has different sensitivity factor. Let's
add a field to set different sensitivity factor for each sensor. Also
update the factors to get more reasonable temperature readings, but
still need more precise calibration.
BUG=chrome-os-partner:9599
TEST=Build and read tempearture succeeded.
Change-Id: Ib4feea3b78b71f6d37c9a02668ffa7bd9e63d390
A temperature polling task is added to achieve temporal correction and
also reduce the latency of reading temperature.
Factor out sensor specific part to keep code clean.
Signed-off-by: Vic Yang <victoryang@chromium.org>
BUG=chrome-os-partner:7801
TEST=On link, 'temps' shows all temperature readings.
Cover each sensor with hand and see object temperature rise.
Compilation succeeded on bds/adv/daisy/discovery.
Change-Id: I3c44c8b2e3ab2aa9ce640d3fc25e7fba56534b86
