m68knommu: fix DMA support for ColdFire

ColdFire CPU family members support DMA (all those with the FEC ethernet
core use it, the rest have dedicated DMA engines). The code support is
just missing a handful of routines for it to be usable by drivers.
Add the missing dma_ functions.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index 4beb59d..5343762 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -16,6 +16,7 @@
 
 config NO_DMA
 	bool
+	depends on !COLDFIRE
 	default y
 
 config FPU