Merge branch 'cpsw-per-channel-shaping'

Ivan Khoronzhuk says:

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cpsw: add per channel shaper configuration

This series is intended to allow user to set rate for per channel
shapers at cpdma level. This patchset doesn't have impact on performance.
The rate can be set with:

echo 100 > /sys/class/net/ethX/queues/tx-0/tx_maxrate

Tested on am572xx
Based on net-next/master
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Signed-off-by: David S. Miller <davem@davemloft.net>