firmware: arm_scmi: Add notifications support in transport layer
Add common transport-layer methods to:
- fetch a notification instead of a response
- clear a pending notification
Add also all the needed support in mailbox/shmem transports.
Link: https://lore.kernel.org/r/20200327143438.5382-4-cristian.marussi@arm.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
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