arm64: dts: qcom: sdm630-xperia: Retire sdm630-sony-xperia-ganges.dtsi

After further consideration, it is not worth to keep another
separate DTSI, as the differences between Nile and Ganges are
very minimal. Instead, let's just address the minimal differences
between Kirin and Mermaid.

Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Link: https://lore.kernel.org/r/20210728222542.54269-34-konrad.dybcio@somainline.org


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