Mini2440 modify 3.17: modify SDCARD driver

1.<plat/mci.h> -> <linux/platform_data/mmc-s3cmci.h>
 .-------------------------------------------------------------------------------.
 |55:22: error: plat/mci.h: No such file or directory                            |
 |467: error: variable 'mini2440_mmc_cfg' has initializer but incomplete type    |
 '-------------------------------------------------------------------------------'

2.add <mach/gpio.h>
 .-------------------------------------------------------------------------------.
 |468: error: implicit declaration of function 'S3C2410_GPG'                     |
 |469: error: implicit declaration of function 'S3C2410_GPH'                     |
 '-------------------------------------------------------------------------------'

3.there is differece:
 Don't need add udelay(50) in drivers/mmc/host/s3cmci.c.
 It's versy stable to detect sdcard.