Move the Kconfig entries from plat-s3c to plat-samsung and plat-s3c24xx
as necessary. The S3C_BOOT entries and the DMA configuration can go to
plat-samsung. The low-level UART configurations are currently S3C2XX
specific and can go to plat-s3c24xx.

Eliminating plat-s3c from the build process will be submitted seperately.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

as per 0560cf5aSigned-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Add a default header for <mach/io.h> for systems
such as the S3C24A0 which do not need any of the
complex code that the S3C2410 uses.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>