dt-bindings: arm: qcom: Add Xiaomi Redmi Note 9S

Document the Xiaomi Redmi Note 9S (curtana) smartphone, which is based
on the Qualcomm SM7125 SoC.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: David Wronek <davidwronek@gmail.com>
Link: https://lore.kernel.org/r/20240121-sm7125-upstream-v4-4-f7d1212c8ebb@gmail.com


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