soc: qcom: glink: Panic if SSR notification to RPM cannot be sent

It is a fatal error if the SSR notification to RPM cannot be sent.
However, the G-Link SSR driver currently continues processing in this
case.

Panic if the SSR notification to RPM cannot be sent.

Change-Id: I33a2396b27c51f493cd39043cb7c5541314aabc0
Signed-off-by: Steven Cahail <scahail@codeaurora.org>