sh: add SH DMAC burst mode constant

The SH7709 datasheet defines bit 5 as set for burst mode, clear for
cycle-steal mode.

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/drivers/dma/dma-sh.h

@@ -29,6 +29,7 @@
 #define RS_IN	0x00000200
 #define RS_OUT	0x00000300
 #define TS_BLK	0x00000040
+#define TM_BUR	0x00000020
 #define CHCR_DE 0x00000001
 #define CHCR_TE 0x00000002
 #define CHCR_IE 0x00000004