rockchip: rk3399: tpl: Mark printascii into debug

Now, we have spl_board_init which has TPL banner prints.

So mark the 'U-Boot TPL board init' print into debug.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3399-board-tpl.c b/arch/arm/mach-rockchip/rk3399-board-tpl.c
index 72d0dd9..4a30124 100644
--- a/arch/arm/mach-rockchip/rk3399-board-tpl.c
+++ b/arch/arm/mach-rockchip/rk3399-board-tpl.c
@@ -47,7 +47,7 @@
 	 * printhex8(0x1234);
 	 * printascii("string");
 	 */
-	printascii("U-Boot TPL board init\n");
+	debug("U-Boot TPL board init\n");
 #endif
 	ret = spl_early_init();
 	if (ret) {