[ARM] 4984/1: S3C24XX: Do not assert nRSTOUT on BAST over suspend.

Change GPA21 to output over reset so that nRSTOUT is not
asserted whilst suspended.

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