dt-bindings: arm: qcom: document MI01.6 board based on IPQ5332 family

Document the MI01.6 (Reference Design Platform 468) board based on IPQ5332
family of SoCs.

Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230323093120.20558-2-quic_kathirav@quicinc.com