phy: realtek: usb: phy-rtk-usb2 and phy-rtk-usb3 needs USB_COMMON

When USB_COMMON are not enabled, phy-rtk-usb2 and phy-rtk-usb3 suffers
a build error due to a missing usb_debug_root that is provided
by CONFIG_USB_COMMON, so make the driver select USB_COMMON.

   or1k-linux-ld: drivers/phy/realtek/phy-rtk-usb2.o: in function `create_phy_debug_root':
>> drivers/phy/realtek/phy-rtk-usb2.c:715: undefined reference to `usb_debug_root'
>> or1k-linux-ld: drivers/phy/realtek/phy-rtk-usb2.c:715: undefined reference to `usb_debug_root'

   or1k-linux-ld: drivers/phy/realtek/phy-rtk-usb3.o: in function `create_phy_debug_root':
>> drivers/phy/realtek/phy-rtk-usb3.c:349: undefined reference to `usb_debug_root'
>> or1k-linux-ld: drivers/phy/realtek/phy-rtk-usb3.c:349: undefined reference to `usb_debug_root'

Fixes: 134e6d2 ("phy: realtek: usb: Add driver for the Realtek SoC USB 2.0 PHY")
Fixed: adda6e8 ("phy: realtek: usb: Add driver for the Realtek SoC USB 3.0 PHY")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202307290733.weSlHrGp-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202307291022.3pVeTR9z-lkp@intel.com/
Signed-off-by: Stanley Chang <stanley_chang@realtek.com>
Link: https://lore.kernel.org/r/20230729053029.6226-1-stanley_chang@realtek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/phy/realtek/Kconfig

@@ -7,6 +7,7 @@ config PHY_RTK_RTD_USB2PHY
 	depends on USB_SUPPORT
 	select GENERIC_PHY
 	select USB_PHY
+	select USB_COMMON
 	help
 	  Enable this to support Realtek SoC USB2 phy transceiver.
 	  The DHC (digital home center) RTD series SoCs used the Synopsys
@@ -18,6 +19,7 @@ config PHY_RTK_RTD_USB3PHY
 	depends on USB_SUPPORT
 	select GENERIC_PHY
 	select USB_PHY
+	select USB_COMMON
 	help
 	  Enable this to support Realtek SoC USB3 phy transceiver.
 	  The DHC (digital home center) RTD series SoCs used the Synopsys