Merge branch 'ddwmac-sun8i-cleanup-and-shutdown-hook'

Samuel Holland says:

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dwmac-sun8i cleanup and shutdown hook

These patches clean up some things I noticed while fixing suspend/resume
behavior. The first four are minor code improvements. The last one adds
a shutdown hook to minimize power consumption on boards without a PMIC.

Changes v1 to v2:
  - Note the assumption of exclusive reset controller access in patch 3
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Signed-off-by: David S. Miller <davem@davemloft.net>