sh: SH-DMAC compile fixes

This patch does the following:
- remove the make_ipr_irq stuff from dma-sh.c and replace it
  with a simple channel<->irq mapping table.
- add DMTEx_IRQ constants for sh4 cpus
- fix sh7751 DMAE irq number

The SH7780 uses the same IRQs for DMA as other SH4 types, so
I put the constants on top of the dma.h file.

Other CPU types need to #define their own DMTEx_IRQ contants
in their appropriate header.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh4/setup-sh7750.c

@@ -101,7 +101,7 @@ static struct ipr_data sh7750_ipr_map[] = {
 	{ 35, 2,  8, 7 }, /* DMAC DMTE1 */
 	{ 36, 2,  8, 7 }, /* DMAC DMTE2 */
 	{ 37, 2,  8, 7 }, /* DMAC DMTE3 */
-	{ 28, 2,  8, 7 }, /* DMAC DMAE */
+	{ 38, 2,  8, 7 }, /* DMAC DMAE */
 };
 
 static struct ipr_data sh7751_ipr_map[] = {