riscv: kernel: idle.c: implement cpu_idle()

Required by panic() to abort current execution. It ensures memory
operations were complete and stalls the hart.

Signed-off-by: Marouene Boubakri <marouen

riscv: kernel: idle.c: implement cpu_idle()

Required by panic() to abort current execution. It ensures memory
operations were complete and stalls the hart.

Signed-off-by: Marouene Boubakri <marouene.boubakri@nxp.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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