irqchip/metag-ext: Report that effective affinity is a single target

The metag-ext driver only targets a single CPU at a time, even if
the notional affinity is wider. Let's inform the core code
about this.

Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Andrew Lunn <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Paul Burton <[email protected]>
Cc: Chris Zankel <[email protected]>
Cc: Kevin Cernekee <[email protected]>
Cc: Wei Xu <[email protected]>
Cc: Max Filippov <[email protected]>
Cc: Florian Fainelli <[email protected]>
Cc: Gregory Clement <[email protected]>
Cc: Matt Redfearn <[email protected]>
Cc: Sebastian Hesselbarth <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]

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