[Buildroot] Bump ATF version in arm_juno_defconfig ?

[Thomas Petazzoni]

Hello Joao,

You originally contributed the arm_juno_defconfig in Buildroot. It
currently uses v1.2 of ATF, and I encountered a build failure with this
ATF version as part of the Buildroot test suite:

    ./build/juno/release/bl1/context_mgmt.o: In function `cm_prepare_el3_exit':
    context_mgmt.c:(.text.cm_prepare_el3_exit+0x54): undefined reference to `cm_set_next_context'
    context_mgmt.c:(.text.cm_prepare_el3_exit+0x54): relocation truncated to fit: R_AARCH64_JUMP26 against undefined symbol `cm_set_next_context'

This issue has been fixed since ATF v1.3. Do you think you could
provide a patch bumping the ATF version ? The latest version is ATF
v1.5, so if you could bump the defconfig, it would be nice.

In addition, it would be great if you could send a patch adding
yourself in the DEVELOPERS file for this platform, so we easily know who
to contact for questions related to this platform.

Thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com