Warnings with xilinx_zynqmp_virt

[Simon Glass]

Hi Michal,

I am seeing errors when building xilinx_zynqmp_virt:

Can't set hash 'value' property for 'hash' node(FDT_ERR_NOSPACE)
Can't set hash value for 'hash' hash node in 'fdt_35' image node
Can't add verification data for node 'fdt_35' (<unknown error>)

The problem is visible in CI, e.g. [1]

A bisect points to this, but it might not be helpful:

46f04087712 (refs/bisect/bad) arm64: zynqmp: Add support for vck190
revB system controller

Also the board seems to be the only one still using SPL_FIT_GENERATOR.
The migration message was added almost 3 years ago. Would it be
possible to move it to use Binman?

===================== WARNING ======================
This board uses CONFIG_SPL_FIT_GENERATOR. Please migrate
to binman instead, to avoid the proliferation of
arch-specific scripts with no tests.
====================================================

Regards,
Simon

[1] https://source.denx.de/u-boot/u-boot/-/jobs/861282