core: riscv: add thread_optee_abi.c

This commit just copies thread_optee_smc.c from ARM and renames
smc/SMC to abi/ABI.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Alv

core: riscv: add thread_optee_abi.c

This commit just copies thread_optee_smc.c from ARM and renames
smc/SMC to abi/ABI.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Reviewed-by: Alvin Chang <alvinga@andestech.com>
Tested-by: Alvin Chang <alvinga@andestech.com>

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