multi_v7_defconfig: make Rockchip usb2-phy built-in

The phy is necessary for the dwc2 controllers driving the usb ports
on all arm32 Rockchip socs. Both the dwc2 as well as usb downstream
drivers (mass-storage as well as usb networking) are already built-in,
so only the phy is missing to allow booting from usb-devices without
to much hassle.
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NOlof Johansson <olof@lixom.net>

arch/arm/configs/multi_v7_defconfig

@@ -885,7 +885,7 @@ CONFIG_TI_PIPE3=y
 CONFIG_PHY_BERLIN_USB=y
 CONFIG_PHY_BERLIN_SATA=y
 CONFIG_PHY_ROCKCHIP_DP=m
-CONFIG_PHY_ROCKCHIP_USB=m
+CONFIG_PHY_ROCKCHIP_USB=y
 CONFIG_PHY_QCOM_APQ8064_SATA=m
 CONFIG_PHY_MIPHY28LP=y
 CONFIG_PHY_RCAR_GEN2=m