DPAA: Minor performance improvementsHEADmain

* Add interrupt coalescing for DQRR and MR, with thresholds and period
  as tunable sysctls under the `hw.qman` tree.
* Do lazy/sloppy buffer management to avoid constantly checking
  thresholds via QMan portal round-trips.
* Add cache stashing to prewarm caches, reducing latency.
* Fix the definition of Context_A in the init_fq MC command/result
  structures, they're 64-bit fields, not 32-bit.
* Reorder the dpaa_eth_frame_info as a bit of cleanup.
* Take advantage of the fact that UMA small allocations are returned in
  the DMAP, and avoid pmap_kextract().

These changes together improve throughput by ~1.5%
(925Mbps->935-940Mbps) consistently, and reduce CPU usage by a bit,
increasing idle CPU from 30%->35% minimum.

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