Revert "uboot-imx6: bump to 2021.01 release"

This reverts commit 50a5a899 as the bump
to 2021.01 unveiled issue with missing swig host tool needed for
mx6cuboxi's SPL.

Signed-off-by: Petr Štetiar <ynezz@true.cz>

package/boot/uboot-imx6/Makefile

@@ -7,10 +7,10 @@
 
 include $(TOPDIR)/rules.mk
 
-PKG_VERSION:=2021.01
+PKG_VERSION:=2020.04
 PKG_RELEASE:=1
 
-PKG_HASH:=b407e1510a74e863b8b5cb42a24625344f0e0c2fc7582d8c866bd899367d0454
+PKG_HASH:=fe732aaf037d9cc3c0909bad8362af366ae964bbdac6913a34081ff4ad565372
 
 include $(INCLUDE_DIR)/u-boot.mk
 include $(INCLUDE_DIR)/package.mk

package/boot/uboot-imx6/patches/0001-apalis_imx6_defconfig-enable-some-useful-commands.patch

-From 40fea3f6913086566586ba3a7304e28e670c9455 Mon Sep 17 00:00:00 2001
+From 630b39c46b29de1874149c6b2c18c64966a0fabf Mon Sep 17 00:00:00 2001
 From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz>
 Date: Sun, 1 Mar 2020 22:47:31 +0100
 Subject: [PATCH] apalis_imx6_defconfig: enable some useful commands
@@ -14,26 +14,24 @@ Signed-off-by: Petr Štetiar <ynezz@true.cz>
  configs/apalis_imx6_defconfig | 5 +++++
  1 file changed, 5 insertions(+)
 
-diff --git a/configs/apalis_imx6_defconfig b/configs/apalis_imx6_defconfig
-index 1c791ab74846..4d21e9680747 100644
 --- a/configs/apalis_imx6_defconfig
 +++ b/configs/apalis_imx6_defconfig
-@@ -46,6 +46,7 @@ CONFIG_CMD_I2C=y
- # CONFIG_CMD_LOADB is not set
- # CONFIG_CMD_LOADS is not set
+@@ -44,6 +44,7 @@ CONFIG_CMD_GPIO=y
+ CONFIG_CMD_GPT=y
+ CONFIG_CMD_I2C=y
  CONFIG_CMD_MMC=y
 +CONFIG_CMD_PART=y
  CONFIG_CMD_USB=y
  CONFIG_CMD_USB_SDP=y
  CONFIG_CMD_USB_MASS_STORAGE=y
-@@ -58,6 +59,10 @@ CONFIG_CMD_PMIC=y
+@@ -53,6 +54,10 @@ CONFIG_CMD_PMIC=y
  CONFIG_CMD_REGULATOR=y
  CONFIG_OF_CONTROL=y
- CONFIG_ENV_OVERWRITE=y
+ CONFIG_DEFAULT_DEVICE_TREE="imx6-apalis"
 +CONFIG_CMD_EXT4=y
 +CONFIG_CMD_EXT4_WRITE=y
 +CONFIG_CMD_FAT=y
 +CONFIG_CMD_FS_GENERIC=y
  CONFIG_ENV_IS_IN_MMC=y
  CONFIG_SYS_RELOC_GD_ENV_ADDR=y
- CONFIG_SYS_MMC_ENV_PART=1
+ CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y

package/boot/uboot-imx6/patches/110-mx6cuboxi-mmc-fallback.patch

+--- a/board/solidrun/mx6cuboxi/mx6cuboxi.c
++++ b/board/solidrun/mx6cuboxi/mx6cuboxi.c
+@@ -286,6 +286,12 @@ static void setup_iomux_enet(void)
+ 	gpio_free_list_nodev(&desc, 1);
+ }
+ 
++void board_boot_order(u32 *spl_boot_list)
++{
++	spl_boot_list[0] = spl_boot_device();
++	spl_boot_list[1] = BOOT_DEVICE_MMC1;
++}
++
+ int board_phy_config(struct phy_device *phydev)
+ {
+ 	if (phydev->drv->config)