soc: qcom: glink: Reset qos rate when xprt is down

Reset for qos rate of xprt is not done duering SSR, this leads to
exhaustion of qos bandwidth when multiple SSR happens.

Reset qos rate of xprt to zero when link goes down.

CRs-Fixed: 2061061
Change-Id: Ibabca5584b01eb93a5b7fcc8a5304136ef400ba0
Signed-off-by: Dhoat Harpal <hdhoat@codeaurora.org>