firmware: arm_scmi: Add discovery of SCMI v2.0 performance fastchannels

SCMI v2.0 adds support for "FastChannel", a lightweight unidirectional
channel that is dedicated to a single SCMI message type for controlling
a specific platform resource. They do not use a message header as they
are specialized for a single message.

Only PERFORMANCE_LIMITS_{SET,GET} and PERFORMANCE_LEVEL_{SET,GET}
commands are supported over fastchannels. As they are optional, they
need to be discovered by PERFORMANCE_DESCRIBE_FASTCHANNEL command.
Further {LIMIT,LEVEL}_SET commands can have optional doorbell support.

Add support for discovery of these fastchannels.

Cc: Ionela Voinescu <[email protected]>
Cc: Chris Redpath <[email protected]>
Cc: Quentin Perret <[email protected]>
Reviewed-by: Peng Fan <[email protected]>
Signed-off-by: Sudeep Holla <[email protected]>

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