rockchip: rk3188: add rk_board_late_init() hook

All other rockchip boards have rk_board_late_init() hook,
so add it to rk3188 boards also.
Signed-off-by: NAlexander Kochetkov <al.kochet@gmail.com>
Acked-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: NPhilipp Tomsich <philipp.tomsich@theobroma-systems.com>

arch/arm/mach-rockchip/rk3188-board.c

@@ -17,6 +17,11 @@
 #include <asm/gpio.h>
 #include <dm/pinctrl.h>
 
+__weak int rk_board_late_init(void)
+{
+	return 0;
+}
+
 int board_late_init(void)
 {
 	struct rk3188_grf *grf;
@@ -32,7 +37,7 @@ int board_late_init(void)
 			NOC_REMAP_MASK << NOC_REMAP_SHIFT);
 	}
 
-	return 0;
+	return rk_board_late_init();
 }
 
 int board_init(void)