firmware: arm_scmi: Add v3.2 clock CONFIG_GET support

Add support for v3.2 clock CONFIG_GET command and related new clock
protocol operation state_get() to retrieve the status of a clock.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20230826125308.462328-4-cristian.marussi@arm.com


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