The "max78000fthr" machine does not work anymore

As of QEMU v10.2.0-rc3, the "max78000fthr" machine is not selectable in the qemu-system-aarch64 binary anymore, even though it's compiled into the binary (CONFIG_MAX78000FTHR=y is set in the .mak files).

Bisecting the issue shows that this has been broken by commit 1e18e343 ("config/target: Implement per-binary TargetInfo structure (ARM, AARCH64)").