[PATCH] ARM: OMAP: MAX_DMA_CHANNELS definition

Currently OMAP doesn't define a MAX_DMA_CHANNELS value, which leads to:

  CC      arch/arm/kernel/dma.o
  arch/arm/kernel/dma.c:27:5: warning: "MAX_DMA_CHANNELS" is not defined

It seems like the sensible thing to do is to set this to 0 so this entire
API is just avoided, as everything is using the OMAP-specific one now
anyways.

include/asm-arm/arch-omap/dma.h

@@ -22,6 +22,7 @@
 #define __ASM_ARCH_DMA_H
 
 #define MAX_DMA_ADDRESS			0xffffffff
+#define MAX_DMA_CHANNELS		0
 
 /* Hardware registers for omap1 */
 #define OMAP_DMA_BASE			(0xfffed800)