ARM: debug: remove extraneous DEBUG_HI3716_UART option

DEBUG_HI3716_UART was supposed to be renamed to DEBUG_HIX5HD2_UART, but
accidentally both got left in place, which results in a build error when
CONFIG_DEBUG_UART_PHYS is not set as it should be.

This removes the old symbol.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 12aae309 ("ARM: debug: Rename Hi3716 to HIX5HD2")
Acked-by: Wei Xu <xuwei5@hisilicon.com>

arch/arm/Kconfig.debug

@@ -268,14 +268,6 @@ choice
 		  Say Y here if you want kernel low-level debugging support
 		  on HI3620 UART.
 
-	config DEBUG_HI3716_UART
-		bool "Hisilicon Hi3716 Debug UART"
-		depends on ARCH_HI3xxx
-		select DEBUG_UART_PL01X
-		help
-		  Say Y here if you want kernel low-level debugging support
-		  on HI3716 UART.
-
 	config DEBUG_HIGHBANK_UART
 		bool "Kernel low-level debugging messages via Highbank UART"
 		depends on ARCH_HIGHBANK