ARM: dts: qcom: sdx65: Add Shared memory manager support

Add smem node to support shared memory manager on SDX65 platform.

Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1651480665-14978-5-git-send-email-quic_rohiagar@quicinc.com