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Expose boot performance metrics via ACPI FPDT #145

@xen0n

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@xen0n

The table is used by boot performance profiling tools such as systemd-analyze:

https://github.com/systemd/systemd/blob/v259/src/shared/boot-timestamps.c#L21-L26

https://github.com/systemd/systemd/blob/v259/src/shared/acpi-fpdt.c#L108

I believe this should be useful long-term when LoongArch system integrators eventually need to optimize their boot-time performance.

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