sh: fix DMAOR register access on SH7709
sh7709 hardware manual says DMAOR is 16 bits long on this platform. Tested and working with a modified smsc911x ethernet driver (sh-dma support patch for this driver is coming soon). Signed-off-by: NSteve Glendinning <steve.glendinning@smsc.com> Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
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