Kleine-König <Uwe.Kleine-Koenig@digi.com> 1204288073 +0100
committer Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com> 1206944221 +0200

ns9xxx: make use of the chip's irq priorisation

The irq controller automatically masks the current and all lower prioritised
tasks until the current irq is acked.

Signed-off-by: Uwe Kleine-König <Uwe.Kleine-Koenig@digi.com>
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