interconnect: qcom: Use the new common helper for node removal

interconnect: qcom: Use the new common helper for node removal

There is a new helper function for removing all nodes. Let's use it instead
of duplicating the code.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>