dt-bindings: remoteproc: qcom,glink-rpm-edge: convert to DT schema

Convert Qualcomm G-Link RPM edge binding to DT schema.  Move it to
remoteproc as it better suits the purpose - communication channel with
remote processor.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>