arm64: dts: qcom: ipq8074: add SMEM support

IPQ8074 uses SMEM like other modern QCA SoC-s, so since its already
supported by the kernel add the required DT nodes.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220106212512.1970828-1-robimarko@gmail.com