phy: rockchip-inno-usb2: select USB_COMMON

When USB is disabled, we get a link error for this driver
because of the added OTG support

drivers/phy/phy-rockchip-inno-usb2.o: In function `rockchip_usb2phy_otg_sm_work':
phy-rockchip-inno-usb2.c:(.text.rockchip_usb2phy_otg_sm_work+0x1f4): undefined reference to `usb_otg_state_string'
drivers/phy/phy-rockchip-inno-usb2.o: In function `rockchip_usb2phy_probe':
phy-rockchip-inno-usb2.c:(.text.rockchip_usb2phy_probe+0x2c8): undefined reference to `of_usb_get_dr_mode_by_phy'

Other phy drivers select USB_COMMON for this, so let's do the same
here.

Fixes: 0c42fe48fd23 ("phy: rockchip-inno-usb2: support otg-port for rk3399")
Signed-off-by: Arnd Bergmann <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/Kconfig

···
 	tristate "Rockchip INNO USB2PHY Driver"
 	depends on (ARCH_ROCKCHIP || COMPILE_TEST) && OF
 	depends on COMMON_CLK
+	depends on USB_SUPPORT
 	select GENERIC_PHY
+	select USB_COMMON
 	help
 	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.