support/testing: fix test_atf by bumping atf to 2.11

Since commit [1], test_atf is failing. See [2].

Passing -no-pie to ld does not produce the bl31.elf file (and does not
generate an error). TF-A 2.11 reworked its makefiles and switched to
gcc to link files. This commit fixes this failing test by updating to
this newer TF-A version.

Fixes: [2].

[1] https://gitlab.com/buildroot.org/buildroot/-/commit/248c2d045e780b23e6ed19fec1f242460ac464e3
[2] https://gitlab.com/buildroot.org/buildroot/-/jobs/8609307891

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Romain Naour <romain.naour@smile.fr>

support/testing/tests/boot/test_atf.py

@@ -9,7 +9,7 @@ class TestATFAllwinner(infra.basetest.BRTest):
         BR2_TOOLCHAIN_EXTERNAL_LINARO_AARCH64=y
         BR2_TARGET_ARM_TRUSTED_FIRMWARE=y
         BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION=y
-        BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION_VALUE="v2.9"
+        BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION_VALUE="v2.11"
         BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM="sun50i_a64"
         # BR2_TARGET_ARM_TRUSTED_FIRMWARE_SSP is not set
         BR2_TARGET_ARM_TRUSTED_FIRMWARE_BL31=y