Sync boot LUN before reset

[adeebshihadeh]

qdl can leave a device unbootable if the GPT A/B metadata and UFS boot LUN disagree. The observed disk state was GPT marking _b active/bootable while the UFS boot LUN still pointed at LUN 1. ABL then fails before Linux:

Active Slot _b is bootable, retry count 6
Boot lun: 1 and BootableSlot: _b do not match
Err: line:1527 FindBootableSlot() status: Device Error

Fastboot avoids this through SetActiveSlot(): even when the requested slot is already active, it checks the UFS boot LUN and rewrites it to match the slot (_a -> 1, _b -> 2). Normal qdl flash scripts do not call setactiveslot; they flash and then reset, so the mismatch survives.

This syncs the UFS boot LUN from the detected active slot before reset. If no A/B slot metadata is present, reset proceeds unchanged.

Tested:

• bun test
• bun run build
• bun run lint
• hardware: active _b reset now sends setbootablestoragedrive value=2; ABL logs Booting from slot (_b) instead of the mismatch error.