[ARM] 4546/1: s3c2410: fix architecture typo for s3c2442

From: Krzysztof Helt <krzysztof.h1@wp.pl>

This patch fixes a typo in architecture constant name.
The kernel for s3c2442 machines does not build without
this fix.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Acked-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>