Separate the bd99992gw ADC interface from the NCP15WB thermistor
adc-to-temp maths so that the thermistor can be used with various
other interfaces.
BUG=chrome-os-partner:44764
TEST=make buildall -j
Manual on Glados. Boot to S0, run "temps".
Verify that temperatures start around 28C and begin to increase after
system is powered-on for a long duration.
BRANCH=None
Change-Id: I3e72e9f390feebaac2440dbe722485f8d1cf8c56
Signed-off-by: Wonjoon Lee <woojoo.lee@samsung.com>
Reviewed-on: https://chromium-review.googlesource.com/296871
Reviewed-by: Shawn N <shawnn@chromium.org>