soc: qcom: glink_ssr: Remove subsystem_restart call

Glink_ssr channel calls subsystem_restart when remote side does not
responds. This leads to system crash if remote side is already in
shutdown state.

Call to subsystem_restart is removed from glink_ssr client.

CRs-Fixed: 2061085
Change-Id: I0df382950d34d8c8d4e2bc1cbbe5edef1d4135c1
Signed-off-by: Dhoat Harpal <hdhoat@codeaurora.org>