arm64: dts: qcom: qcs404: align RPM G-Link node with bindings

Bindings expect (and most of DTS use) the RPM G-Link node name to be
"rpm-requests".

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230208101545.45711-2-krzysztof.kozlowski@linaro.org