ARM: omap: clean up DMA register accesses

We can do much better with this by using a structure to describe each
register, rather than code.

Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --cc arch/arm/mach-omap1/dma.c
Simple merge

diff --cc arch/arm/mach-omap2/dma.c
Simple merge

diff --cc include/linux/omap-dma.h
Simple merge