uboot-tools: Enable FIT image support

We need FIT image support for netboot, but it is also in general quite a
handy feature.

patches/openwrt/to-upstream/0019-u-boot-tools-Add-mkimage-tool.patch

@@ -103,8 +103,8 @@ index a9eccec..1e2c351 100644
 +		NO_SDL=1 \
 +		envtools defconfig
 +	mv $(PKG_BUILD_DIR)/tools/env/fw_printenv $(PKG_BUILD_DIR)
-+	sed -i 's|^\(CONFIG_RSA.*\)=y|# \1 is not set|' $(PKG_BUILD_DIR)/.config
-+	sed -i 's|^\(CONFIG_FIT\)=y|# \1 is not set|' $(PKG_BUILD_DIR)/.config
++	echo 'CONFIG_FIT=y' >> $(PKG_BUILD_DIR)/.config
++	echo 'CONFIG_MULTI_DTB_FIT=n' >> $(PKG_BUILD_DIR)/.config
 +	$(MAKE) -C $(PKG_BUILD_DIR) \
 +		CROSS_COMPILE="$(TARGET_CROSS)" \
 +		TARGET_CFLAGS="$(TARGET_CFLAGS)" \

patches/openwrt/to-upstream/0020-u-boot-tools-disable-efi-turris1x.patch

@@ -13,8 +13,8 @@ index 1e2c35178c..467d0c9b86 100644
 +++ b/package/boot/uboot-tools/Makefile
 @@ -80,6 +80,9 @@ define Build/Compile
  	mv $(PKG_BUILD_DIR)/tools/env/fw_printenv $(PKG_BUILD_DIR)
- 	sed -i 's|^\(CONFIG_RSA.*\)=y|# \1 is not set|' $(PKG_BUILD_DIR)/.config
- 	sed -i 's|^\(CONFIG_FIT\)=y|# \1 is not set|' $(PKG_BUILD_DIR)/.config
+ 	echo 'CONFIG_FIT=y' >> $(PKG_BUILD_DIR)/.config
+ 	echo 'CONFIG_MULTI_DTB_FIT=n' >> $(PKG_BUILD_DIR)/.config
 +ifeq ($(CONFIG_TARGET_mpc85xx_p2020_DEVICE_cznic_turris1x),y)
 +	sed -i 's|^\(CONFIG_EFI_LOADER=y\)|CONFIG_EFI_LOADER=n|' $(PKG_BUILD_DIR)/.config
 +endif