ARM: OMAP2+: DMA: Moving OMAP2+ DMA channel definitions to mach-omap2

Similar to omap1, some of the omap2+ dma channel definitions are
used by some drivers. For moving omap2+ dma channel definitions
to mach-omap2/, the used ones should be defined locally to driver.
Drivers can eliminate it using DT, platform data, or IORESOURCE_DMA
And moving omap2+ DMA channel definitions to mach-omap2

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/drivers/mtd/nand/omap2.c b/drivers/mtd/nand/omap2.c
index 5b31386..3105f22 100644
--- a/drivers/mtd/nand/omap2.c
+++ b/drivers/mtd/nand/omap2.c
@@ -111,6 +111,8 @@
 #define	ECCCLEAR			0x100
 #define	ECC1				0x1
 
+#define OMAP24XX_DMA_GPMC		4
+
 /* oob info generated runtime depending on ecc algorithm and layout selected */
 static struct nand_ecclayout omap_oobinfo;
 /* Define some generic bad / good block scan pattern which are used