Claude review: drm/panthor: Automatically enable interrupts in panthor_fw_wait_acks()

[Claude Code Review Bot <claude-review@example.com>]

Patch Review

Instead of enabling all `ack_irq_mask` bits at init time, this patch:
1. Only enables `GLB_IDLE` in the global interface's `ack_irq_mask` (for async events)
2. Only enables `CS_FATAL | CS_FAULT | CS_TILER_OOM` for CS slots
3. Only enables `CSG_SYNC_UPDATE | CSG_IDLE | CSG_PROGRESS_TIMER_EVENT` for CSG slots
4. Temporarily enables additional interrupt bits in `panthor_fw_wait_acks()` when polling fails and we need to fall back to waiting

The `panthor_fw_wait_acks()` modification:
```c
scoped_guard(spinlock_irqsave, lock)
    *ack_irq_mask_ptr |= req_mask;

ret = wait_event_timeout(...);

scoped_guard(spinlock_irqsave, lock)
    *ack_irq_mask_ptr &= ~req_mask;
```

**Minor concern:** The `lock` parameter passed is the interface's `lock` field. This protects the `ack_irq_mask` update against concurrent FW toggle/update operations on the same interface, which is correct. The temporary enablement window is bounded by the `wait_event_timeout`, and the mask is cleared unconditionally afterward. This is a nice optimization to reduce unnecessary interrupt traffic.

No significant concerns.

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