dt-bindings: mfd: qcom,tcsr: Add compatible for qcs615

Document the qcom,qcs615-tcsr compatible.

Signed-off-by: Lijuan Gao <quic_lijuang@quicinc.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20240920-add_tcsr_compatible_for_qcs615-v2-1-8ce2dbc7f72c@quicinc.com


Signed-off-by: Lee Jones <lee@kernel.org>