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 <[email protected]>
Signed-off-by: Max Filippov <[email protected]>

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