dt-bindings: soc: qcom,aoss-qmp: Document the qcs615

Document the Always-On Subsystem Qualcomm Message Protocol(AOSS_QMP)
on the Qualcomm qcs615 platform.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Kyle Deng <quic_chunkaid@quicinc.com>
Link: https://lore.kernel.org/r/20241018073417.2338864-3-quic_chunkaid@quicinc.com


[bjorn: Fixed subject prefix]
Signed-off-by: Bjorn Andersson <andersson@kernel.org>