dt-bindings: soc: qcom,aoss-qmp: Document the QCS8300 AOSS channel

dt-bindings: soc: qcom,aoss-qmp: Document the QCS8300 AOSS channel

Document the Always-On Subsystem side channel on the Qualcomm QCS8300
platform for communication with client found on the SoC such as
remoteprocs.

Signed-off-by: Kyle Deng <quic_chunkaid@quicinc.com>
Signed-off-by: Jingyi Wang <quic_jingyw@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20240911-qcs8300_binding-v2-4-de8641b3eaa1@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>