plat-sam: add sm_platform_handler() stub

Add sm_platform_handler() to handle SMC. For the moment, this is
stubbed and will allow to handle SiP specific SMC.

Acked-by: Jens Wiklander <jens.wiklander

plat-sam: add sm_platform_handler() stub

Add sm_platform_handler() to handle SMC. For the moment, this is
stubbed and will allow to handle SiP specific SMC.

Acked-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>

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