ARM: AT2440EVB: Remove duplicated s3c_device_sdi.name set

The AT2440EVB should not be changing the s3c_device_sdi.name as this is
part of the initialisation process done by the CPU detection process
and actually present in arch/arm/plat-s3c24xx/s3c24xx.c.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>