Patch from Ben Dooks

Change all S3C24XX_VA defines to have the type `void __iomem *`
and the necessary changes to the other bits of the s3c24xx
support.
Note, the map_desc will need changing in the future to allow
`void __iomem *` instead of an unsigned long for IO

Signed-off-by: Ben Dooks
Signed-off-by: Russell King