ACPI / PPTT: Add helper to validate cache nodes from an offset [dead]

hulk inclusion
category: feature
bugzilla: 28055
CVE: NA

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The MPAM table holds a PPTT-offset that describes a cache. Add a
helper acpi_pptt_validate_cache_node(), which checks this offset
really is in the PPTT, on a node boundary, and that node really
is a cache.

With this the MPAM probe code can go poking through struct cacheinfo
looking for a level with a matching firmware_node.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-By: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>