ARM: S5P6440: Add support for I2C channel 0 and 1 on SMDK6440

This patch adds helper functions for I2C channel 0 and 1, GPIO
configurations for I2C on S5P6440 and support I2C-0/1 devices
on SMDK6440.

Signed-off-by: Naveen Krishna Ch <ch.naveen@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Conflicts:

	arch/arm/mach-s5p6440/Kconfig
	arch/arm/mach-s5p6440/include/mach/map.h
	arch/arm/mach-s5p6440/mach-smdk6440.c