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Add the support for counting some of the SCMI communication debug metrics
like how many were sent successfully or with some errors, responses
received, notifications and delayed responses, transfer timeouts and
errors from the firmware/platform.

In many cases, the traces exists. But the traces are not always necessarily
enabled and getting such cumulative SCMI communication debug metrics helps
in understanding if there are any possible improvements that can be made
on either side of SCMI communication.
Signed-off-by: Luke Parkin <luke.parkin@arm.com>
Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>
Tested-by: Cristian Marussi <cristian.marussi@arm.com>
Message-Id: <20240805131013.587016-4-sudeep.holla@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>