[OE-core] [oe-core] DISK_SIGNATURE no longer functional

[Davis, Michael]

I am trying to create a generic MSDOS PC_BIOS hdddirect image with a root partition set by the DISK_SIGNATURE.
SYSLINUX_ROOT = "root=PARTUUID=${DISK_SIGNATURE}-02"

However the signature generated in syslinux.cfg and the one on the disk don't match.
I tried defining my own signature and the one in syslinux changes, but the one on the disk doesn't match.

root=PARTUUID=22aaf83b-02

NAME   PARTUUID
sdd
├─sdd2 341e84a7-02
├─sdd3 341e84a7-03
└─sdd1 341e84a7-01
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