ARM: dts: qcom: sdx55: Add reserved memory nodes

This adds reserved memory nodes to the SDX55 dtsi as defined by v6 of
the memory map

Signed-off-by: Vinod Koul <vkoul@kernel.org>
[mani: moved modem regions to board dts]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20210106125322.61840-3-manivannan.sadhasivam@linaro.org


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