ARM: dts: msm: Add regulator cooling device for QCS405

Add regulator cooling device for CX regulator for QCS405.
The cooling device will be used to place voltage floor restriction.

Change-Id: If349f69d9a53405d43f53e7386d4a8ed4b2c86f0
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>