firmware: arm_scmi: Initialise known ACPI protocol devices and channels

Unlike Device Tree, the ACPI SCMI namespace device does not provide
child fwnodes to represent each protocol. Iterate over the non-BASE
entries in scmi_dsd_info_list to initialize their protocol devices and
transport channels. The BASE channel and device are handled by the
common setup path.

Let the transport channel-availability and SCMI protocol implementation
checks decide which of the known protocols are usable on the platform.

Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Link: https://patch.msgid.link/20260915-acpi_scmi_pcc-v5-8-298579e9f359@kernel.org
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>

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