[process-reboot-cause] Save boot_id and device fields for DPU reboot cause

[chartsai-nvidia]

Why I did it

DPU reboot-cause entries written to CHASSIS_STATE_DB were missing the boot_id and
device fields, so consumers couldn't correlate a DPU reboot with its boot instance or
source device. NPU entries are unaffected.

Work item tracking

• Microsoft ADO (number only): N/A

How I did it

• Defined NPU_REBOOT_CAUSE_DB_FIELDS (cause, time, user, comment) and
  DPU_REBOOT_CAUSE_DB_FIELDS (adds boot_id, device) in process-reboot-cause.
• Replaced the hardcoded per-field db.set calls with a loop over the field set
  selected by device type, so DPU rows now include boot_id and device.

How to verify it

• Run the unit tests: tests/process-reboot-cause_test.py now asserts that a DPU
  reboot-cause file results in boot_id and device being written to
  CHASSIS_STATE_DB.

[mssonicbld]

/azp run

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This PR has backport request label(s) for branch(es): 202605, but is missing required test information. Please make sure you tick the tested branch(es) in the Tested branch section and provide test evidence (e.g., 202605: <test result>) in the Test result section as well in your PR description.

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