Waag and SOS both stall when legacy UART passthrough

[YuanXin-Intel]

Describe the bug
When passthrough legacy UART (on super IO chip) to Waag. Windows UART driver could initialize the UART. But once send or receive data through UART, Waag would stall and SOS would stall too.

Codebase
ACRN release 3.3

Scenario
SOS + Windows as post launch VM

To Reproduce
Steps to reproduce the behavior:

1. Passthrough legacy UART to Waag with "acpidev_pt" option in launch script, for example:
   --acpidev_pt PNP0501,uid=12,type=io_port,min=0x248,len=8 --acpidev_pt PNP0501,uid=12,type=irq,irq=11
2. Launch Windows Guest VM
3. Open UART in Windows and communicate with peer device
4. Waag and even SOS stall

Expected behavior
UART passthrough to Windows could communicate with peer device

Additional context
Attach the following logs if available:
The log of windows configuring the vioapic for UART irq:

The log of Windows configuring VT-d entry for UART irq: