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: If89533ec0717935a6263e0e1c7f883cd57869127
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>