firmware: arm_scmi: Add a common helper to check if a message is supported

A common helper is provided to check if a specific protocol message is
supported or not.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20240212123233.1230090-3-cristian.marussi@arm.com


Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>