ARM: S5PV210: Add usb otg phy control

This patch supports to control usb otg phy of S5PV210. Based on
setup-usb-phy.c of S3C64XX.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
[Test HW: GONI S5PC110]
Tested-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>