Merge branch 'net-stmmac-improve-WOL'

Jisheng Zhang says:

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net: stmmac: improve WOL

Currently, stmmac driver relies on the HW PMT to support WOL. We want
to support phy based WOL.

patch1 is a small improvement to disable WAKE_MAGIC for PMT case if
no pmt_magic_frame.
patch2 and patch3 are two prepation patches.
patch4 implement the phy based WOL
patch5 tries to save a bit energy if WOL is enabled.
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Signed-off-by: David S. Miller <davem@davemloft.net>