atl1c: remove SMB/CMB DMA related code
l1c & later chips don't support DMA for SMB. CMB is removed from hardware. reg(15C8) is used to trig interrupt by tpd threshold. Signed-off-by: Nxiong <xiong@qca.qualcomm.com> Tested-by: NLiu David <dwliu@qca.qualcomm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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