rockchip: rk3308: fix board_debug_uart_init

Definition of function board_debug_uart_init() must be under
CONFIG_DEBUG_UART_BOARD_INIT and not under CONFIG_DEBUG_UART,
as it was: see debug_uart.h. In this way the debug uart can
be used but its board-specific initialization skipped by
configuration, if useless.

Signed-off-by: Massimo Pegorer <massimo.pegorer@vimar.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3308/rk3308.c b/arch/arm/mach-rockchip/rk3308/rk3308.c
index dd9109b..5763604 100644
--- a/arch/arm/mach-rockchip/rk3308/rk3308.c
+++ b/arch/arm/mach-rockchip/rk3308/rk3308.c
@@ -174,7 +174,7 @@
 	return 0;
 }
 
-#if defined(CONFIG_DEBUG_UART)
+#ifdef CONFIG_DEBUG_UART_BOARD_INIT
 __weak void board_debug_uart_init(void)
 {
 	static struct rk3308_grf * const grf = (void *)GRF_BASE;