serial: sh-sci: fix handling of SCIFB sh-mobile ports
SCIFB ports have a slightly different register layout and a different FIFO size from SCIFA ports, in DMA mode they have to be treated just like SCIFA. Signed-off-by: NGuennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
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