usb:udc: remove reference to AVR32 architecture in Atmel USBA Kconfig

The AVR32 architecture does no longer exist in the Linux kernel, hence
remove a reference to it in Kconfig help text to avoid confusion.
Signed-off-by: Hans-Christian Noren Egtvedt <egtvedt@samfundet.no>

drivers/usb/gadget/udc/Kconfig

@@ -59,8 +59,8 @@ config USB_ATMEL_USBA
 	tristate "Atmel USBA"
 	depends on ARCH_AT91
 	help
-	  USBA is the integrated high-speed USB Device controller on
-	  the AT32AP700x, some AT91SAM9 and AT91CAP9 processors from Atmel.
+	  USBA is the integrated high-speed USB Device controller on some
+	  AT91SAM9 and AT91CAP9 processors from Atmel.
 
 	  The fifo_mode parameter is used to select endpoint allocation mode.
 	  fifo_mode = 0 is used to let the driver autoconfigure the endpoints.