rockchip: rk3188: Migrate to use common board file

Use common board file for board_init() and board_late_init(),
for Rockchip SoCs have very similar process.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/Kconfig

@@ -38,6 +38,7 @@ config ROCKCHIP_RK3188
 	select SPL_ROCKCHIP_EARLYRETURN_TO_BROM
 	select SPL_ROCKCHIP_BACK_TO_BROM
 	select BOARD_LATE_INIT
+	imply ROCKCHIP_COMMON_BOARD
 	imply SPL_ROCKCHIP_COMMON_BOARD
 	help
 	  The Rockchip RK3188 is a ARM-based SoC with a quad-core Cortex-A9

arch/arm/mach-rockchip/Makefile

@@ -22,7 +22,6 @@ ifeq ($(CONFIG_SPL_BUILD)$(CONFIG_TPL_BUILD),)
 obj-y += boot_mode.o
 obj-$(CONFIG_ROCKCHIP_COMMON_BOARD) += board.o
 
-obj-$(CONFIG_ROCKCHIP_RK3188) += rk3188-board.o
 obj-$(CONFIG_ROCKCHIP_RK3288) += rk3288-board.o
 obj-$(CONFIG_ROCKCHIP_RK3399) += rk3399-board.o
 obj-$(CONFIG_ROCKCHIP_RV1108) += rv1108-board.o

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

-// SPDX-License-Identifier: GPL-2.0+
-/*
- * (C) Copyright 2015 Google, Inc
- */
-
-#include <common.h>
-#include <clk.h>
-#include <dm.h>
-#include <ram.h>
-#include <asm/gpio.h>
-#include <asm/io.h>
-#include <asm/arch-rockchip/periph.h>
-#include <asm/arch-rockchip/boot_mode.h>
-
-__weak int rk_board_late_init(void)
-{
-	return 0;
-}
-
-int board_late_init(void)
-{
-	setup_boot_mode();
-
-	return rk_board_late_init();
-}
-
-int board_init(void)
-{
-	return 0;
-}
-
-#if !CONFIG_IS_ENABLED(SYS_DCACHE_OFF)
-void enable_caches(void)
-{
-	/* Enable D-cache. I-cache is already enabled in start.S */
-	dcache_enable();
-}
-#endif