Fixed bug in disk-label support package
Fixed bug in disk-label support package

The "offset" function only worked for partitions starting within the first
4 GiB of the disk.
Also increased the amount of data to be read from a PReP partition since some
clients are certainly bigger than 2 MiB nowadays.

k0da/SLOF,agraf/SLOF,agraf/SLOF,qemu/SLOF,k0da/SLOF,leilihh/SLOF,leilihh/SLOF,open-power-host-os/slof,k0da/SLOF,mdroth/SLOF,leilihh/SLOF,aik/SLOF,open-power-host-os/slof,dgibson/SLOF,mdroth/SLOF,aik/SLOF,leilihh/SLOF,dgibson/SLOF,stefanberger/SLOF-tpm,dgibson/SLOF,dgibson/SLOF,qemu/SLOF,mdroth/SLOF,stefanberger/SLOF-tpm,aik/SLOF,qemu/SLOF,k0da/SLOF,mdroth/SLOF,agraf/SLOF,agraf/SLOF,stefanberger/SLOF-tpm,open-power-host-os/slof,open-power-host-os/slof