ARM: omap: move dma channel allocation into plat-omap code

This really needs to be there, because otherwise the plat-omap code can
kfree() this data structure, and then re-use the pointer later.

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 arch/arm/plat-omap/dma.c
Simple merge

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