net: axienet: fix compile errors
When merging mainline commit bb193e3d ("net: axienet: fix for TX busy handling"), the old function axienet_check_tx_bd_space was brought back, so we need to delete it to fix compile error. When merging mainline commit 95978df6 ("net: axienet: add missing memory barriers"), some part about dma_rmb is lost, add it back. Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com> Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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