core: pta: scmi: internal switches for supported transports

Adds internal configuration switch _CFG_SMCI_PTA_SMT_HEADER
and _CFG_SCMI_PTA_MSG_HEADER to specify which are supported.
This change will

core: pta: scmi: internal switches for supported transports

Adds internal configuration switch _CFG_SMCI_PTA_SMT_HEADER
and _CFG_SCMI_PTA_MSG_HEADER to specify which are supported.
This change will ease integration of the alternate SCMI server
build from SCP-firmware.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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core: pta: scmi: new API to support MSG header communication protocol

in the SCMI PTA.
Adds a new capability and a new command to the SCMI PTA API to support
SCMI MSG header communication protocol.

core: pta: scmi: new API to support MSG header communication protocol

in the SCMI PTA.
Adds a new capability and a new command to the SCMI PTA API to support
SCMI MSG header communication protocol. Capability
PTA_SCMI_CAPS_MSG_HEADER allows client and service to negotiate the
desired transport configuration. Command PTA_SCMI_CMD_PROCESS_MSG_CHANNEL
allows client to request processing of a message sent based on that
message exchange protocol where input and output SCMI messages are
exchange using OP-TEE shared memory references provided by the
client.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>

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core: pta: scmi: new interface to REE SCMI agent

Adds a PTA interface to REE SCMI agents to get SCMI message communication
channel for processing in OP-TEE SCMI server.

Currently implement supports

core: pta: scmi: new interface to REE SCMI agent

Adds a PTA interface to REE SCMI agents to get SCMI message communication
channel for processing in OP-TEE SCMI server.

Currently implement supports for a SCMI server built with
CFG_SCMI_MSG_SMT=y. The implementation is made so that an alternate
SCMI server implementation can added.

Client gets SCMI channel capabilities with PTA_SCMI_CMD_CAPABILITIES.
Client gets a handle for an SCMI channel with command
PTA_SCMI_CMD_GET_CHANNEL_HANDLE.
Client pushes SCMI messages with command PTA_SCMI_CMD_PROCESS_SMT_CHANNEL
or PTA_SCMI_CMD_PROCESS_SMT_CHANNEL_MESSAGE.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>

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