soc: qcom: Set QOS only to silver cluster

CDSPRM module implements a RPMSG interface to communicate with CDSP
while providing a way for CDSP to vote for CPU QoS to benefit CDSP
applications performance.Glink IRQ mostly is taken by the
silver cluster.CDSPRM driver vote for sliver cluster prevents
collapsing gold cluster.This saves significant power.

Change-Id: I6cac71e7ab85d823dfc44b19dd85a0dde62455db
Acked-by: Sreekanth Gande <sgande@qti.qualcomm.com>
Signed-off-by: Bavyasritha Alahari <alahari@codeaurora.org>