configs/baseline/profiledef.sh: use LZMA compression for the EROFS image
Now that xz 5.4 is out and erofs-utils is built with LZMA support, it is
possible to compress the EROFS image with LZMA for higher compression.
mkfs.erofs
trows a few warnings about using experimental features, but
they should not be an issue.
Nothing changes for the releng profile, for now at least.