xtensa: add Three Core HiFi-2 MX Variant.

This variant has coherent cache, is equipped with interrupt distributor
and is capable of running SMP linux.

Signed-off-by: Piet Delaney <piet.delaney@gmai

xtensa: add Three Core HiFi-2 MX Variant.

This variant has coherent cache, is equipped with interrupt distributor
and is capable of running SMP linux.

Signed-off-by: Piet Delaney <piet.delaney@gmail.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

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