dt-bindings: arm: qcom: Add sdm630 and sdm660 SoCs

Add a SoC strings for the Qualcomm SDM630 and SDM660 SoCs.
Also document the new xiaomi,lavender compatible used in
a device tree binding.

Signed-off-by: Alexey Minnekhanov <alexey.min@gmail.com>
Link: https://lore.kernel.org/r/20200417012630.222352-2-alexey.min@gmail.com


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