usb: dwc3: Use ASCII space in Kconfig

The USB_DWC3_ULPI Kconfig entry uses a UTF-8 non-breaking space (0xca20)
instead of a regular ASCII space (0x20). Commit 2e0d737f ("kconfig:
don't silently ignore unhandled characters") exposes this by warning
about unhandled characters.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/Kconfig

@@ -13,7 +13,7 @@ if USB_DWC3
 
 config USB_DWC3_ULPI
 	bool "Register ULPI PHY Interface"
-	depends on USB_ULPI_BUS=y || USB_ULPI_BUS=USB_DWC3
+	depends on USB_ULPI_BUS=y || USB_ULPI_BUS=USB_DWC3
 	help
 	  Select this if you have ULPI type PHY attached to your DWC3
 	  controller.