e1000: Propagate hardware initialization failuresHEADmain

The reset helper discards reset_hw and init_hw errors.  Runtime
initialization then continues programming rings and filters, and iflib
publishes the interface as running even though the controller did not
reach a usable state.  Initial attach similarly continues into NVM and
MAC setup after a failed reset.

Return errors from the reset helper.  Fail attach when the controller
cannot be reset or initialized, and report runtime failures through
iflib_init_failed() so iflib leaves the interface stopped.  Also stop
register accesses and report the error when a stop-path reset fails.

MFC after:	2 weeks
Sponsored by:	BBOX.io

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