rockchip: board: rk3288: remove board_boot_order()

Prefer to use dts config instead, remove all board_boot_order()
for rk3288 boards.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/amarula/vyasa-rk3288/vyasa-rk3288.c b/board/amarula/vyasa-rk3288/vyasa-rk3288.c
index 2b509f5..baf197c 100644
--- a/board/amarula/vyasa-rk3288/vyasa-rk3288.c
+++ b/board/amarula/vyasa-rk3288/vyasa-rk3288.c
@@ -6,14 +6,6 @@
 #include <common.h>
 
 #ifndef CONFIG_TPL_BUILD
-#include <spl.h>
-
-void board_boot_order(u32 *spl_boot_list)
-{
-	/* eMMC prior to sdcard. */
-	spl_boot_list[0] = BOOT_DEVICE_MMC2;
-	spl_boot_list[1] = BOOT_DEVICE_MMC1;
-}
 
 int spl_start_uboot(void)
 {
diff --git a/board/chipspark/popmetal_rk3288/popmetal-rk3288.c b/board/chipspark/popmetal_rk3288/popmetal-rk3288.c
index 355c78b..9ba1fbd 100644
--- a/board/chipspark/popmetal_rk3288/popmetal-rk3288.c
+++ b/board/chipspark/popmetal_rk3288/popmetal-rk3288.c
@@ -4,16 +4,8 @@
  */
 
 #include <common.h>
-#include <spl.h>
 #include <asm/gpio.h>
 
-void board_boot_order(u32 *spl_boot_list)
-{
-	/* eMMC prior to sdcard */
-	spl_boot_list[0] = BOOT_DEVICE_MMC2;
-	spl_boot_list[1] = BOOT_DEVICE_MMC1;
-}
-
 #define GPIO7A3_HUB_RST	227
 
 int rk_board_late_init(void)
diff --git a/board/mqmaker/miqi_rk3288/miqi-rk3288.c b/board/mqmaker/miqi_rk3288/miqi-rk3288.c
index d6992a2..779bc64 100644
--- a/board/mqmaker/miqi_rk3288/miqi-rk3288.c
+++ b/board/mqmaker/miqi_rk3288/miqi-rk3288.c
@@ -3,12 +3,3 @@
  * (C) Copyright 2016 Rockchip Electronics Co., Ltd
  */
 
-#include <common.h>
-#include <spl.h>
-
-void board_boot_order(u32 *spl_boot_list)
-{
-	/* eMMC prior to sdcard. */
-	spl_boot_list[0] = BOOT_DEVICE_MMC2;
-	spl_boot_list[1] = BOOT_DEVICE_MMC1;
-}
diff --git a/board/rockchip/evb_rk3288/evb-rk3288.c b/board/rockchip/evb_rk3288/evb-rk3288.c
index d6992a2..779bc64 100644
--- a/board/rockchip/evb_rk3288/evb-rk3288.c
+++ b/board/rockchip/evb_rk3288/evb-rk3288.c
@@ -3,12 +3,3 @@
  * (C) Copyright 2016 Rockchip Electronics Co., Ltd
  */
 
-#include <common.h>
-#include <spl.h>
-
-void board_boot_order(u32 *spl_boot_list)
-{
-	/* eMMC prior to sdcard. */
-	spl_boot_list[0] = BOOT_DEVICE_MMC2;
-	spl_boot_list[1] = BOOT_DEVICE_MMC1;
-}
diff --git a/board/rockchip/fennec_rk3288/fennec-rk3288.c b/board/rockchip/fennec_rk3288/fennec-rk3288.c
index ce45544..779bc64 100644
--- a/board/rockchip/fennec_rk3288/fennec-rk3288.c
+++ b/board/rockchip/fennec_rk3288/fennec-rk3288.c
@@ -3,12 +3,3 @@
  * (C) Copyright 2016 Rockchip Electronics Co., Ltd
  */
 
-#include <common.h>
-#include <spl.h>
-
-void board_boot_order(u32 *spl_boot_list)
-{
-	/* eMMC prior to sdcard */
-	spl_boot_list[0] = BOOT_DEVICE_MMC2;
-	spl_boot_list[1] = BOOT_DEVICE_MMC1;
-}