serial: Use s3c2440 driver for S3C2416 SoC

UARTs in the S3C2416 are almost same as in S3C2443 and can be handled by
s3c2440 serial driver.

Signed-off-by: Yauhen Kharuzhy <jekhor@gmail.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>