support/testing: fix TestATFAllwinner test case

This test case uses a too old U-Boot version, which is affected by the
infamous libfdt header conflict issue. Let's update to U-Boot 2017.11,
which is used by our current bananapi_m64_defconfig that was the
inspiration for this test case.

Fixes:

  https://gitlab.com/buildroot.org/buildroot/-/jobs/107860310

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

support/testing/tests/boot/test_atf.py

@@ -40,7 +40,7 @@ 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="2017.09"
+        BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2017.11"
         BR2_TARGET_UBOOT_BOARD_DEFCONFIG="bananapi_m64"
         BR2_TARGET_UBOOT_NEEDS_DTC=y
         BR2_TARGET_UBOOT_NEEDS_ATF_BL31=y