core: provide arch_scall.h

Provide scall functions to deal with the layout of the architecture
specific struct thread_scall_regs. The new static inline scall_
functions are based on the old internal

core: provide arch_scall.h

Provide scall functions to deal with the layout of the architecture
specific struct thread_scall_regs. The new static inline scall_
functions are based on the old internal static functions in
core/arch/arm/tee/arch_svc.c.

This patch doesn't change any behaviour.

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

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