firmware: arm_scmi: Add common notifier helpers
Add a pair of notifier chains and generic empty notifier callbacks. Currently they are still unused but they will be used to act properly on device request and creation events. Signed-off-by: Cristian Marussi <cristian.marussi@arm.com> Link: https://lore.kernel.org/r/20221222185049.737625-5-cristian.marussi@arm.com Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
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