optee: isolate smc abi

Isolate the ABI based on raw SMCs. Code specific to the raw SMC ABI is
moved into smc_abi.c. This makes room for other ABIs with a clear
separation.

The driver changes to use module_init()/module_exit() instead of
module_platform_driver(). The platform_driver_register() and
platform_driver_unregister() functions called directly to keep the same
behavior. This is needed because module_platform_driver() is based on
module_driver() which can only be used once in a module.

A function optee_rpc_cmd() is factored out from the function
handle_rpc_func_cmd() to handle the ABI independent part of RPC
processing.

This patch is not supposed to change the driver behavior, it's only a
matter of reorganizing the code.

Reviewed-by: Sumit Garg <[email protected]>
Signed-off-by: Jens Wiklander <[email protected]>

Author: jenswi-linaro

drivers/tee/optee/Makefile

@@ -4,8 +4,8 @@ optee-objs += core.o
 optee-objs += call.o
 optee-objs += rpc.o
 optee-objs += supp.o
-optee-objs += shm_pool.o
 optee-objs += device.o
+optee-objs += smc_abi.o
 
 # for tracing framework to find optee_trace.h
-CFLAGS_call.o := -I$(src)
+CFLAGS_smc_abi.o := -I$(src)