ARM: OMAP1: Remove dma.h

Add definitions in arch/arm/mach-omap1/dma.h are now removed so remove
the file and include statements from dma.c and lcd_dma.c.

Signed-off-by: Jarkko Nikula <jarkko.nikula@bitmer.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>