drivers: regulator_aop: Add snapshot for AOP regulator cdev

Add AOP based regulator cooling device from kernel 4.9. This is snapshot
as of 'commit <4395d5994> ("driver: thermal: regulator_aop: Rename AOP
Regulator cooling device")'.

Change-Id: If51ff52fd9cf25d520cfe100f66604693a2ed1b9
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>