soc: qcom: glink: Reset responded flag in SSR channel callback data

When a response to an SSR notification is received, a flag is set. This
flag is only reset when the channel is created. This means that if a
subsystem restarts several times, this flag will only be set to true
once, and if the subsystem being notified becomes unresponive, the
driver will be unaware and will not restart the unresponsive subsystem.

Reset the flag after the response has been received and the timeout for
the response has passed.

Change-Id: I3bea574375ab5911e06e3d0751628004395d0867
Signed-off-by: Steven Cahail <scahail@codeaurora.org>