dt-bindings: soc: qcom: add qcom,qcs615-imem compatible

Document qcom,qcs615-imem compatible. It has a child node for debugging
purposes.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Lijuan Gao <quic_lijuang@quicinc.com>
Link: https://lore.kernel.org/r/20250526-add_qcs615_remoteproc_support-v4-2-06a7d8bed0b5@quicinc.com

Author: lijuangg

Documentation/devicetree/bindings/sram/qcom,imem.yaml

@@ -22,6 +22,7 @@ properties:
           - qcom,msm8974-imem
           - qcom,msm8976-imem
           - qcom,qcs404-imem
+          - qcom,qcs615-imem
           - qcom,qcs8300-imem
           - qcom,qdu1000-imem
           - qcom,sa8775p-imem