powerpc/xics: Add a native ICS backend for microwatt

This is a simple native ICS backend that matches the layout of
the Microwatt implementation of ICS.

Signed-off-by: Benjamin Herrenschmidt <[email protected]>
Signed-off-by: Paul Mackerras <[email protected]>
Reviewed-by: Segher Boessenkool <[email protected]>
[mpe: Add empty ics_native_init() to unbreak non-microwatt builds]
Signed-off-by: Michael Ellerman <[email protected]>

fixup-ics
Link: https://lore.kernel.org/r/[email protected]

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