OvmfPkg: add qemu debug console port to XTRA device

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13618 6f19259b-4bc3-4df7-8a09-765794883524
MU SOURCE COMMIT:5e57fb754a6d50825cb011b02193dc8a3924fc46

Platforms/OvmfPkg/AcpiTables/Dsdt.asl

@@ -445,6 +445,7 @@ DefinitionBlock ("Dsdt.aml", "DSDT", 1, "INTEL ", "OVMF    ", 3) {
             IO (Decode16, 0x278, 0x278, 0x00, 0x08)
             IO (Decode16, 0x370, 0x370, 0x00, 0x02)
             IO (Decode16, 0x378, 0x378, 0x00, 0x08)
+            IO (Decode16, 0x402, 0x402, 0x00, 0x01)        // QEMU debug console, should use FixedPcdGet16 (PcdDebugIoPort)
             IO (Decode16, 0x440, 0x440, 0x00, 0x10)
             IO (Decode16, 0x678, 0x678, 0x00, 0x08)
             IO (Decode16, 0x778, 0x778, 0x00, 0x08)