Merge branch 'stmmac-misc'

Corentin Labbe says:

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stmmac: misc patchs

This is a follow up of my previous stmmac serie which address some comment
done in v2.
====================

Acked-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>