Merge bootloader ELF segments - #1
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Seen in https://github.com/puddly/silabs-firmware-builder/actions/runs/31140225080/job/92748454087.
The GBLv3 bootloader tag performs a single write so there cannot be any gaps. Most bootloader ELFs have contiguous segments naturally but the Yellow broke this assumption. To fix it, we just manually flatten the ELF by filling the gaps with
\xFF.