soc: qcom: glink: Add downvote of transport during SSR

During SSR, down vote transport of xprt is not called.
This leads to transport not being able to go to idle state.

Downvote of transport is called in SSR path.

CRs-Fixed: 2131780
Change-Id: Ic374073187aab95b700aa3f795787819f34d3c3c
Signed-off-by: Dhoat Harpal <hdhoat@codeaurora.org>