sfc: Fold efx_flush_all() into efx_stop_port() and update comments
efx_flush_all() is a really misleading name - it has nothing to do
with e.g. flushing DMA queues. Since it's called immediately after
efx_stop_port() and is highly dependent on what that does, combine
the two functions.
Update comments to explain what this is doing a little better.
Also update an related and erroneous comment in efx_start_port().
Signed-off-by: NBen Hutchings <bhutchings@solarflare.com>
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