firmware: arm_scmi: Use fast channel tracing

Make use of SCMI fast channel event tracing.

Link: https://lore.kernel.org/r/20220704102241.2988447-7-cristian.marussi@arm.com


Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>