ARM: multi_v7_defconfig: Enable XHCI_RCAR

This is used by Renesas R-Car SoCs.
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

arch/arm/configs/multi_v7_defconfig

@@ -577,6 +577,7 @@ CONFIG_SND_SOC_WM8978=m
 CONFIG_USB=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_MVEBU=y
+CONFIG_USB_XHCI_RCAR=m
 CONFIG_USB_EHCI_HCD=y
 CONFIG_USB_EHCI_MSM=m
 CONFIG_USB_EHCI_EXYNOS=y