core: finalize scall layer

Finalizes the new scall layer by renaming remaining files so the generic
scall layer resides in core/include/kernel/scall.h and
core/kernel/scall.c.

New architectures are

core: finalize scall layer

Finalizes the new scall layer by renaming remaining files so the generic
scall layer resides in core/include/kernel/scall.h and
core/kernel/scall.c.

New architectures are expected to provide a
core/arch/arm/include/kernel/arch_scall.h with functions needed to deal
with the architecture specific struct thread_scall_regs usage in
core/kernel/scall.c.

New architectures are also expected to provide an implementation of
scall_save_panic_stack() called from scall_sys_return_helper().

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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