core: arm64: implement __do_semihosting() for Aarch64

Implement __do_semihosting() as documented in the "Semihosting for
Aarch32 and Aarch64" specification [1].

Link: https://github.com/ARM-softwar

core: arm64: implement __do_semihosting() for Aarch64

Implement __do_semihosting() as documented in the "Semihosting for
Aarch32 and Aarch64" specification [1].

Link: https://github.com/ARM-software/abi-aa/blob/2023Q3/semihosting/semihosting.rst [1]
Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@foss.st.com>

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