ARM: dts: msm: Add regulator cooling device for ATOLL

Add regulator cooling device for ATOLL. These cooling devices
will be used to place minimum voltage restriction at low temperature
for CX and MX rails.

Change-Id: I4438fb7bf56569364abc383a52bf3081e3cdb36c
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>