usb: phy: add USB_SUPPORT dependency

The driver now calls of_usb_get_dr_mode_by_phy, which is part of the
USB core layer, and it fails to build when that is not provided:

drivers/phy/phy-sun4i-usb.o: In function `sun4i_usb_phy_probe':
phy-sun4i-usb.c:(.text.sun4i_usb_phy_probe+0x140): undefined reference to `of_usb_get_dr_mode_by_phy'

We already have a couple of other PHY drivers with a dependency
on USB_SUPPORT, so that seems to be the easiest fix here.

An alternative would be to adjust the #ifdef in include/linux/usb/of.h
to also check for CONFIG_USB_SUPPORT.

Signed-off-by: Arnd Bergmann <[e-mail]>
Reviewed-by: Hans de Goede <[e-mail]>
Fixes: b33ecca87df9 ("phy-sun4i-usb: Add support for peripheral-only mode")
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/Kconfig

···
 	depends on RESET_CONTROLLER
 	depends on EXTCON
 	depends on POWER_SUPPLY
+	depends on USB_SUPPORT
 	select GENERIC_PHY
+	select USB_COMMON
 	help
 	  Enable this to support the transceiver that is part of Allwinner
 	  sunxi SoCs.