drivers: thermal: Add support for RPM SMD cooling device

Add a snapshot of RPM SMD cooling device driver from msm-4.14
as of 'commit <f7835e76aab01> ("drivers: thermal: Add support
for RPM SMD cooling device")'.

Change-Id: Ica341e96a2951e5c48dcef66883b5c0af24ba60f
Signed-off-by: Gopala Krishna Nuthaki <gnuthaki@codeaurora.org>