arm64: dts: qcom: sm8350: Add rmtfs node

Add the rmtfs as a reserved memory node.

Signed-off-by: Vinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20210212115532.1339942-4-vkoul@kernel.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>