ARM: multi_v7_defconfig: Drop useless CONFIG_USB_RCAR_PHY=y

The Renesas R-Car (Gen1) USB PHY driver (which is being removed) does
not support DT, and is thus useless in a generic ARM multi-platform
kernel.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/configs/multi_v7_defconfig

@@ -545,7 +545,6 @@ CONFIG_USB_GPIO_VBUS=y
 CONFIG_USB_ISP1301=y
 CONFIG_USB_MSM_OTG=m
 CONFIG_USB_MXS_PHY=y
-CONFIG_USB_RCAR_PHY=m
 CONFIG_USB_GADGET=y
 CONFIG_USB_RENESAS_USBHS_UDC=m
 CONFIG_USB_ETH=m