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add support for x0-x17 registers used by the SMC calls In SMCCC v1.2 [1] arguments are passed in registers x1-x17. Results are returned in x0-x17. This work is inspired from the following kernel commit: arm64: smccc: Add support for SMCCCv1.2 extended input/output registers [1]: https://documentation-service.arm.com/static/5f8edaeff86e16515cdbe4c6?token= Signed-off-by: Abdellatif El Khlifi <abdellatif.elkhlifi@arm.com> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org> Reviewed-by: Simon Glass <sjg@chromium.org> Cc: Tom Rini <trini@konsulko.com>