Under a large scale use we found that the check for a missed doorbell
was taking too much CPU, so we reworked the check to use a per-device
timer rather than a per-queue timer.

Internal patches:
    ionic: remove missed doorbell per-queue timer
    ionic: add per-device doorbell timer
    ionic: tighter test for active napi
    ionic: platform doorbell timer setup

Signed-off-by: Shannon Nelson <[email protected]>

A little bit of code cleanup, plus a fix to move the missed
doorbell handling to the cpu last used by the AdminQ napi.

Internal patches:
    ionic: fix up a few bits left from doorbell fix fix
    ionic: push work items to adminq CPU
    ionic: back off doorbell check timer

Signed-off-by: Shannon Nelson <[email protected]>