netdev: bfin_mac: fix performance issue found by netperf
- Remove dead long delay - Use proper defines - Remove broken implementation of the TX DMA Data Alignment TXDWA feature Signed-off-by: NMichael Hennerich <michael.hennerich@analog.com> Signed-off-by: NMike Frysinger <vapier@gentoo.org> Signed-off-by: NBryan Wu <cooloney@kernel.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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