console: Move UART port defaults to mainboard

Correct selection of UART depends of board layout, not the CPU
internals, so default setting should originate from mainboard.

Change-Id: Ibf0ab0847ccce73c22704e86983dbe3d24ebc8a0
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5618
Tested-by: build bot (Jenkins)
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/cpu/allwinner/a10/Kconfig

@@ -71,8 +71,4 @@ config SYS_SDRAM_BASE
 	hex
 	default 0x40000000
 
-config UART_FOR_CONSOLE
-	int
-	default 0
-
 endif # if CPU_ALLWINNER_A10