[ARM] 3846/1: S3C24XX: Fix osiris memory map

The memory mapping for the Osiris machine
are all off by one bit, and the base address
has been fixed for writing (bit25 is being
checked by the write, but not on read)

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