core: arm: implement cpu_idle()

Implement cpu_idle() on arm and arm64, based on wfi(). With this patch,
a panicked CPU no longer burns cycles needlessly.

Signed-off-by: Jerome Forissier <jerome@for

core: arm: implement cpu_idle()

Implement cpu_idle() on arm and arm64, based on wfi(). With this patch,
a panicked CPU no longer burns cycles needlessly.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>

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