ARM: S3C64XX: Add support for Compact Flash driver on SMDK6410

Following is added for the CF-ATA driver:
	- Platform data strucure instantiation
	- Platform device enabling code
	- Addition of cfcon clock
	- Platform-specific gpio setup code

Signed-off-by: Abhilash Kesavan <a.kesavan@samsung.com>
Signed-off-by: Thomas Abraham <thomas.ab@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>