ARM: spl: atmel: bring in serial device before init

Before setting up the serial communications, bring in the serial
device from the device tree file.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>

arch/arm/mach-at91/spl_atmel.c

@@ -77,6 +77,8 @@ void s_init(void)
 
 void board_init_f(ulong dummy)
 {
+	int ret;
+
 	switch_to_main_crystal_osc();
 
 #ifdef CONFIG_SAMA5D2
@@ -99,6 +101,12 @@ void board_init_f(ulong dummy)
 
 	board_early_init_f();
 
+	ret = spl_init();
+	if (ret) {
+		debug("spl_init() failed: %d\n", ret);
+		hang();
+	}
+
 	preloader_console_init();
 
 	mem_init();