RFR: 8262491: AArch64: CPU description should contain compatible board list [v2]

[Yasumasa Suenaga]

On Mon, 1 Mar 2021 12:33:29 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

>> Many server-class AArch64 machines use ACPI instead of Device Tree so won't have `/proc/device-tree`.
>
>> Many server-class AArch64 machines use ACPI instead of Device Tree so won't have `/proc/device-tree`.
> 
> What file should we refer to detect SoC on server-class machine? Can we detect SoC in same way? (e.g. sysfs)
> If we cannot implement it in same way, I want to fix it for device tree at first.

I refactored the change to separate Linux AArch64 code from common code in new commit.
If we cannot open `/proc/device-tree`, it fallbacks "AArch64" like current implementation.

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PR: https://git.openjdk.java.net/jdk/pull/2759