rockchip: rk3368: 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: NKever Yang <kever.yang@rock-chips.com>

arch/arm/mach-rockchip/Kconfig

@@ -131,6 +131,7 @@ config ROCKCHIP_RK3368
 	select SUPPORT_TPL
 	select TPL_NEEDS_SEPARATE_TEXT_BASE if SPL
 	select TPL_NEEDS_SEPARATE_STACK if TPL
+	imply ROCKCHIP_COMMON_BOARD
 	imply SPL_ROCKCHIP_COMMON_BOARD
 	imply SPL_SEPARATE_BSS
 	imply SPL_SERIAL_SUPPORT

board/geekbuying/geekbox/geekbox.c

@@ -4,8 +4,3 @@
  */
 
 #include <common.h>
-
-int board_init(void)
-{
-	return 0;
-}

board/rockchip/evb_px5/evb-px5.c

@@ -2,9 +2,3 @@
 /*
  * Copyright (c) 2017 Andy Yan
  */
-#include <common.h>
-
-int board_init(void)
-{
-	return 0;
-}

board/rockchip/sheep_rk3368/sheep_rk3368.c

@@ -2,18 +2,3 @@
 /*
  * Copyright (c) 2017 Andy Yan
  */
-#include <common.h>
-#include <asm/io.h>
-#include <asm/arch-rockchip/clock.h>
-#include <asm/arch-rockchip/grf_rk3368.h>
-#include <syscon.h>
-
-int mach_cpu_init(void)
-{
-	return 0;
-}
-
-int board_init(void)
-{
-	return 0;
-}

board/theobroma-systems/lion_rk3368/lion_rk3368.c

@@ -2,21 +2,3 @@
 /*
  * Copyright (c) 2017 Theobroma Systems Design und Consulting GmbH
  */
-#include <common.h>
-#include <dm.h>
-#include <ram.h>
-#include <asm/io.h>
-#include <asm/arch-rockchip/clock.h>
-#include <asm/arch-rockchip/grf_rk3368.h>
-#include <asm/arch-rockchip/timer.h>
-#include <syscon.h>
-
-int mach_cpu_init(void)
-{
-	return 0;
-}
-
-int board_init(void)
-{
-	return 0;
-}