firmware: scmi: use scmi_proto_driver_get() function to get SCMI protocol driver

If there is a SoC specific SCMI protocol driver, using
scmi_proto_driver_get() function can avoid to add SoC specific code to
scmi_agent-uclass.c.

Signed-off-by: Alice Guo <alice.guo@nxp.com>
5 files changed