arm64: dts: qcom: sm4250: Add soc dtsi

The SM4250 is a downclocked version of the SM6115.

Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220919180618.1840194-8-iskren.chernev@gmail.com