Multiport serial port bug in 12 and 13

[David Cross]

Awesome.

Too much of an ask for mfc for beta3?  It is effectively a selective revert of a previous commit



> On Feb 17, 2021, at 5:12 PM, Warner Losh <imp at bsdimp.com> wrote:
> 
> 
> Committed as 955b6109bb36036e9357006be42dfa89cd7cb0f2
> 
> Warner
> 
>> On Tue, Feb 16, 2021 at 12:38 PM David Cross <david at crossfamilyweb.com> wrote:
>> I posted an updated bug report (235016) which has been open for 2 years. The patch effectively backs out a change for enabling MSI interrupts on a range of multiport serial cards that never worked in the first place.
>> 
>> Very low risk change
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