Add the necessary support for the kernel low-level
debug macros via <mach/debug-macro.S>
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

Add the necessary debug macros for the S3C24A0 to enable
kernel debugging, and fix a bug with selecting the wrong
default debug implementation from the base include.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>