dt-bindings: arm: qcom: move swir,mangoh-green-wp8548 board documentation to qcom.yaml

Document into the main qcom.yaml as conversion from swir.txt to dt-schema.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220928-mdm9615-dt-schema-fixes-v4-1-dac2dfaac703@linaro.org