cem ae2a2410df ioat(4): Add support for interrupt coalescing
In I/OAT, this is done through the INTRDELAY register.  On supported
platforms, this register can coalesce interrupts in a set period to
avoid excessive interrupt load for small descriptor workflows.  The
period is configurable anywhere from 1 microsecond to 16.38
milliseconds, in microsecond granularity.

Sponsored by:	EMC / Isilon Storage Division
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