net: stmmac: replace stmmac_mdio_busy_wait by readl_poll_timeout
The stmmac_mdio_busy_wait() function do the same job than readl_poll_timeout(). So is is better to replace it. Signed-off-by: NCorentin Labbe <clabbe.montjoie@gmail.com> Acked-by: NGiuseppe Cavallaro <peppe.cavallaro@st.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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