phy: tegra: select USB_COMMON

A built-in PHY driver cannot link against modular USB core code:

drivers/usb/phy/phy-tegra-usb.o: In function `tegra_usb_phy_probe':
phy-tegra-usb.c:(.text+0x6bc): undefined reference to `usb_get_dr_mode'

This uses a 'select' statement in Kconfig like we have for other such
PHY drivers.

Signed-off-by: Arnd Bergmann <[e-mail]>
Reviewed-by: Dmitry Osipenko <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/phy/Kconfig

···
 config USB_TEGRA_PHY
 	tristate "NVIDIA Tegra USB PHY Driver"
 	depends on ARCH_TEGRA
+	select USB_COMMON
 	select USB_PHY
 	select USB_ULPI
 	help