kernel: Add missing config option for kernel 4.19

Add CONFIG_USB_ROLE_SWITCH otherwise Octeon 4.19 fails compile

Signed-off-by: Daniel Engberg <[email protected]>

target/linux/generic/config-4.19

@@ -5545,6 +5545,7 @@ CONFIG_USB_OHCI_LITTLE_ENDIAN=y
 # CONFIG_USB_RCAR_PHY is not set
 # CONFIG_USB_RENESAS_USBHS is not set
 # CONFIG_USB_RIO500 is not set
+# CONFIG_USB_ROLE_SWITCH is not set
 # CONFIG_USB_RTL8150 is not set
 # CONFIG_USB_RTL8152 is not set
 # CONFIG_USB_S2255 is not set