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CHW-3562: Battery Learning cycle failed with error 0x88 in AFF A70

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Issue

> BMC recovered from unreadable sensor the day prior with no ONTAP reboot:
Record 338: Sat Nov 08 00:11:11.149382 2025 [IPMI.warning]: Recovering BMC due to a non-readable sensor
> Later we see a battery learning cycle start and fail:
Record 409: Sat Nov 08 12:05:11.263893 2025 [IPMI.notice]: 0416 | 02 | EVT: 6f06ffff | Bat_Status | Assertion Event, "Learn Cycle"
Record 410: Sat Nov 08 15:17:02.842815 2025 [BMC.notice]: Battery Learning cycle failed with error 0x88
Record 411: Sat Nov 08 15:17:13.542179 2025 [IPMI.notice]: 0417 | 02 | EVT: ef06ffff | Bat_Status | Deassertion Event, "Learn Cycle"
> We then see the node reboot due to the NVMEM battery unreadable sensor alerts
Record 468: Sun Nov 09 00:12:49.406520 2025 [IPMI.emergency]: env_mgr triggers OS halt:Battery temp unreadable for 2 mins
Record 469: Sun Nov 09 00:13:23.584592 2025 [Controller.notice]: Appliance user command halt.
Record 470: Sun Nov 09 00:13:23.624175 2025 [IPMI.notice]: 0451 | 02 | EVT: 6f03ffff | Sensor 255 | Assertion Event, "Storage OS graceful shutdown"
Record 471: Sun Nov 09 00:13:25.340475 2025 [IPMI Event.critical]: System power down
Record 472: Sun Nov 09 00:13:25.344857 2025 [IPMI.emergency]: Data ONTAP initiated shutdown

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