[Bug 235876] ACPI related commit r330113 broke Microsoft Hyper-V passthrough device on Generation 2 FreeBSD VM

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235876

--- Comment #9 from John Baldwin <jhb at FreeBSD.org> ---
Created attachment 202488
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=202488&action=edit
thunderx2_uart_workaround.patch

Here's an untested patch to restrict ignoring the Producer flag to the Cavium
uarts.  I didn't do a full-blown quirk field and set of quirks since we just
have one for now.  If we ever needed one in the future we could do that (maybe
with a table of _HID values and quirk masks), but for now this change would be
sufficient.  It's probably best to test this on the ThunderX2 first to make
sure it works and then we can see if it fixes the issue on Hyper-V.

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