dt-bindings: remoteproc: qcom,glink-edge: correct label description

Correct the description of 'label' property.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230208101545.45711-7-krzysztof.kozlowski@linaro.org