iavf: Reschedule pending virtchnl replies after the processing budget

The VC worker ignores the pending count returned by iavf_process_adminq.
If a pass exhausts its message budget, replies can remain in the receive
ring without another interrupt to schedule the worker.  During init,
the iflib admin task cannot provide a backstop because init holds the
context lock while waiting for ENABLE_QUEUES to complete.

Reschedule the VC worker after a successful pass with messages remaining.
Keep the per-pass budget and do not retry AdminQ errors.  Stop
self-rescheduling once detach clears INITIALIZED; the existing polling
and reset-recovery gates continue to exclude asynchronous processing.

Validation: reproduced the timeout on a three queue E835 VF under
Hyper-V.  Temporary tracing showed a successful ENABLE_QUEUES reply
already in the guest receive ring after a three-message pass left two
messages pending.  With the fix and no tracing, a GENERIC kernel with
WITNESS and INVARIANTS passed three batches of 30 down/up and MTU
1500/9000 cycles without enable/disable timeouts.

MFC after:	2 weeks
Sponsored by:	BBOX.io

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