ARM: dts: qcom: sdx55: Add Shared memory manager support

Add smem node to support shared memory manager on SDX55 platform.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20210106125322.61840-9-manivannan.sadhasivam@linaro.org


[bjorn: Moved smem node out from /soc]
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>