drivers: thermal: snapshot of thermal core from msm-4.9

Add a snapshot of thermal core framework changes from msm-4.9.
This is snapshot as of 'commit <e30952e4635> ("drivers: thermal: Avoid
race condition in updating the cooling device")'.

Change-Id: I8e2ba1085d6d3b6797cbbdb64b083322857ae6d5
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>