Only register gpio banks provided by SoC instead of the maximum possible
to lessen confusion, get rid of a warning from gpiolib and stop it from
eating into the extra gpios for configs with S3C24XX_GPIO_EXTRA != 0.
Signed-off-by: NPeter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>