arm64: dts: qcom: Add support for the Xiaomi SM7125 platform

There are 6 Xiaomi smartphones with the SM7125 SoC:

- POCO M2 Pro (gram)
- Redmi Note 9S (curtana)
- Redmi Note 9 Pro (Global, joyeuse)
- Redmi Note 9 Pro (India, curtana)
- Redmi Note 9 Pro Max (excalibur)
- Redmi Note 10 Lite (curtana)

These devices share a common board design (a.k.a miatoll) with only a
few differences. Add support for the common board, as well as support
for the global Redmi Note 9 Pro.

Signed-off-by: David Wronek <davidwronek@gmail.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230824091737.75813-5-davidwronek@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>