[ARM] 4883/1: Adds some missing gpio defines for S3C2410

This is a small addition of forgotten defines to regs-gpio.h include file for the Samsung S3C2410 ARM9 SoC

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