power: qcom-step-chg: Add temperature based step-charging

It supports for temperature (JEITA) based step charging.
The solution samples the battery temperature periodically and
applies the FCC from a static look-up table.

There is a provision for timed hysteresis which is achieved using
a 5 second delayed work.

Change-Id: Ica18f2c812232d6938799dab16fb9f18bc14b48f
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>