phy: Kconfig: Update config for Exynos USB DRD

USB DWC3 driver on Exynos platform does not work without its
corresponding phy driver. Hence make the PHY driver depend on
Exynos DWC3 driver and default it to yes to make things easier
for the end user.

Signed-off-by: Sachin Kamat <[e-mail]>
Reviewed-by: Jingoo Han <[e-mail]>
Tested-by: Vivek Gautam <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/Kconfig

···
 	tristate "Exynos5 SoC series USB DRD PHY driver"
 	depends on ARCH_EXYNOS5 && OF
 	depends on HAS_IOMEM
+	depends on USB_DWC3_EXYNOS
 	select GENERIC_PHY
 	select MFD_SYSCON
+	default y
 	help
 	  Enable USB DRD PHY support for Exynos 5 SoC series.
 	  This driver provides PHY interface for USB 3.0 DRD controller