fix: exit iPXE into local disk on DPUs via sanboot

[shevchenko-evgeny]

When a new BFB is uploaded to a DPU, the iPXE script ends in a bare exit, leaving it to the firmware to continue down the boot order and start the OS from the local drive. That does not always work — the DPU sometimes just hangs instead of booting from disk. This may become less important if NICO gets rid of PXE DPU provisioning.

Related issues

Add support for PowerEdge XE9780

Type of Change

• Add - New feature or capability
• Change - Changes in existing functionality
• Fix - Bug fixes
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Testing

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