ARM: dts: msm: Add qcom,aop-ddrss-cmds node for SM8150

Add the qcom,aop-ddrss-cmds device tree node for
the transmission of messages to AOP to change the DDRSS'
behavior.

Change-Id: I2098d984c76afa3a80a8d09c3f30dd803a0d9cbc
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>