arm64: dts: qcom: sc7180: Delete kingoftown-rev0

The earliest kingoftown that I could find in my pile of boards was
-rev2 and even that revision looks pretty rough (plastics on the case
are very unfinished). Though I don't actually have details about how
many -rev0 devices were produced, I can't imagine anyone still using
one. Let's delete support.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230302131031.v2.2.I68cbe5d5d45074428469da8c52f1d6a78bdc62fc@changeid