ARM: S5P: Fix compilation error for exynos4_defconfig

Added Kconfig entry for setup-usb-phy.c on which EHCI support
is dependent on.

Following the naming convention of other setup files, we have
following renaming.
	usb-phy.c ==> setup-usb-phy.c

Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>