usb: phy: Remove unused Renesas R-Car (Gen1) USB PHY driver

As of commit 3d7608e4c1 ("ARM: shmobile: bockw: remove legacy
board file and config"), the Renesas R-Car (Gen1) USB PHY driver is no
longer used.
In theory it could still be used on R-Car Gen1 SoCs, but that would
require adding DT support to the driver. Instead, a new driver using the
generic PHY framework should be written, as was done for R-Car Gen2.

Remove the driver for good.

Acked-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/phy/Kconfig

@@ -186,19 +186,6 @@ config USB_MXS_PHY
 
 	  MXS Phy is used by some of the i.MX SoCs, for example imx23/28/6x.
 
-config USB_RCAR_PHY
-	tristate "Renesas R-Car USB PHY support"
-	depends on USB || USB_GADGET
-	depends on ARCH_R8A7778 || ARCH_R8A7779 || COMPILE_TEST
-	select USB_PHY
-	help
-	  Say Y here to add support for the Renesas R-Car USB common PHY driver.
-	  This chip is typically used as USB PHY for USB host, gadget.
-	  This driver supports R8A7778 and R8A7779.
-
-	  To compile this driver as a module, choose M here: the
-	  module will be called phy-rcar-usb.
-
 config USB_ULPI
 	bool "Generic ULPI Transceiver Driver"
 	depends on ARM || ARM64