lpc32xx: Kconfig: switch to CONFIG_CONS_INDEX

There's nothing special or unique to the lpc32xx that requires its own config
parameter for specifying the console uart index. Therefore instead of using
the lpc32xx-specific CONFIG_SYS_LPC32XX_UART include parameter, use the
already-available CONFIG_CONS_INDEX from Kconfig.

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/board/timll/devkit3250/devkit3250.c b/board/timll/devkit3250/devkit3250.c
index 3c744b9..9d4ffb0 100644
--- a/board/timll/devkit3250/devkit3250.c
+++ b/board/timll/devkit3250/devkit3250.c
@@ -38,7 +38,7 @@
 
 int board_early_init_f(void)
 {
-	lpc32xx_uart_init(CONFIG_SYS_LPC32XX_UART);
+	lpc32xx_uart_init(CONFIG_CONS_INDEX);
 	lpc32xx_i2c_init(1);
 	lpc32xx_i2c_init(2);
 	lpc32xx_ssp_init();