dt-bindings: arm: qcom: add board-id/msm-id for MSM8956, SDM636 and SM4250

Allow qcom,board-id and qcom,msm-id leagcy properties on these older
platforms: MSM8956, SDM636 and SM4250.  Also mention more OnePlus
devices using modified qcom,board-id field.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20221214150605.173346-1-krzysztof.kozlowski@linaro.org