USB: Add Samsung Exynos OHCI diver

This patch adds USB OHCI driver for Samsung EXYNOS SoCs.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>