Replace SoC specific GPIO functions with the gpiolib API. The LED
gpio is freed right after it is configured so it can be acquired
in the s3c24xx_led driver.

This change is required for converting the s3c24xx_led driver
to the gpiolib API.
Signed-off-by: NSylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: NHarald Welte <laforge@gnumonks.org>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>