[Bug 246552] aarch64 ACPI detection fails on some platforms

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246552

            Bug ID: 246552
           Summary: aarch64 ACPI detection fails on some platforms
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: greg at unrelenting.technology

On some machines, the ACPI check (`has_acpi = (acpi_find_table(ACPI_SIG_SPCR)
!= 0)` in sys/arm64/arm64/machdep.c) seems to fail — the kernel refuses to use
ACPI even with kern.cfg.order=acpi, and hardcoding `has_acpi = true` helps.

Confirmed on two devices now:

- Raspberry Pi 4 https://github.com/pftf/RPi4 (by me)
- SolidRun HoneyComb LX2K / CEX7 module (NXP Layerscape LX2160A)
https://github.com/SolidRun/edk2-platforms (by Dan Kotowski on freebsd-arm@)

They *do* have the SPCR table of course.

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