support/testing: fix TestATFAllwinner test

Fix U-Boot config snippet in TestATFAllwinner. Bump U-Boot
version to fix DTC build on hosts with gcc 10 and add
pylibfdt dependency.

Signed-off-by: Sergey Matyukevich <geomatsi@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

support/testing/tests/boot/test_atf.py

@@ -41,9 +41,10 @@ class TestATFAllwinner(infra.basetest.BRTest):
         BR2_TARGET_UBOOT=y
         BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
         BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-        BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2017.11"
+        BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2020.10"
         BR2_TARGET_UBOOT_BOARD_DEFCONFIG="bananapi_m64"
         BR2_TARGET_UBOOT_NEEDS_DTC=y
+        BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
         BR2_TARGET_UBOOT_NEEDS_ATF_BL31=y
         BR2_TARGET_UBOOT_FORMAT_CUSTOM=y
         BR2_TARGET_UBOOT_FORMAT_CUSTOM_NAME="u-boot.itb"