xmm: wait for +XLSRSTOP URC before starting next session

It is important to gracefully stop the session before starting the
next session, making sure the engine is completely stopped. This can
be ensured by waiting for the +XLSRSTOP URC just after having received
the +XLSRSTOP command response.

We'll do an explicit wait for that URC with a 10s timeout, in order to
avoid waiting forever if the URC is never received. It will be assumed
that the engine is off if the 10s timeout happens, in the same way as
we were doing until now.

During the wait time for the URC, the operation task ownership is
shared among the response processor, the URC handler and the timeout
source. Once any of them decides to complete the task, the others will
automatically avoid attempting to complete the same task.

Based on a patch originally developed by:
Som_SP <somashekhar.puttagangaiah@intel.com>

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