arm: xea: Call spl_early_init() before DM serial console is enabled in SPL

The in-spl enabled DM serial console requires the board setup to be
able to parse SPL_OF_PLATDATA based serial driver (pl01x) for the
imx28 based XEA board.

Signed-off-by: Lukasz Majewski <lukma@denx.de>
diff --git a/board/liebherr/xea/xea.c b/board/liebherr/xea/xea.c
index ed2b39f..e4d2eb6 100644
--- a/board/liebherr/xea/xea.c
+++ b/board/liebherr/xea/xea.c
@@ -62,6 +62,7 @@
 void board_init_f(ulong arg)
 {
 	init_clocks();
+	spl_early_init();
 	preloader_console_init();
 }