irqchip/gic-v3-its: Introduce the reserved device ID pools

virt inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8K8HP


CVE: NA

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Organize the system-wide unused device IDs to build several device ID
pools. Use these pools to manage the reserved device IDs which can be
used by virtual devices (without the actual HW device ID).

Signed-off-by: wanghaibin <wanghaibin.wang@huawei.com>
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Kunkun Jiang <jiangkunkun@huawei.com>
Signed-off-by: Dongxu Sun <sundongxu3@huawei.com>