[ARM] 4180/1: S3C24XX: Update docs for S3C2412 and S3C2413

The S3C2412 and S3C2413 are supported, so document
this as so

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