soc: qcom: glink_probe: Return if rpmsg_send fails

During the SSR notification, the glink_ssr callback should return
immediately if rpmsg_send returns an error since no response from the
remote processor is expected.

Change-Id: I462dcbf90482f127fe310dc6d8af34f8104b9016
Signed-off-by: Chris Lew <clew@codeaurora.org>