[ARM] 3754/1: S3C24XX: tidy arch/arm/mach-s3c2410/Makefile

Patch from Ben Dooks

tidy up the makefile by using TABs to indent, and ensure
that all items are indented the same.

Move the DMA to its own section, ready for the next set
of updates

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>