OvmfPkg/Microvm: wire up serial console, drop super-io

Microvm has no LPC bridge, so drop the PciSioSerialDxe driver.
Use SerialDxe instead, with ioport hardcoded to 0x3f8 aka com1 aka ttyS0.

With this tianocore boots to uefi shell prompt on the serial console.
Direct kernel boot can be used too.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3599
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>

OvmfPkg/Microvm/MicrovmX64.dsc

@@ -230,6 +230,8 @@
 [LibraryClasses.common]
   BaseCryptLib|CryptoPkg/Library/BaseCryptLib/BaseCryptLib.inf
   VmgExitLib|OvmfPkg/Library/VmgExitLib/VmgExitLib.inf
+  SerialPortLib|MdeModulePkg/Library/BaseSerialPortLib16550/BaseSerialPortLib16550.inf
+  PlatformHookLib|MdeModulePkg/Library/BasePlatformHookLibNull/BasePlatformHookLibNull.inf
 
 [LibraryClasses.common.SEC]
   QemuFwCfgLib|OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgSecLib.inf
@@ -534,6 +536,11 @@
   # Point to the MdeModulePkg/Application/UiApp/UiApp.inf
   gEfiMdeModulePkgTokenSpaceGuid.PcdBootManagerMenuFile|{ 0x21, 0xaa, 0x2c, 0x46, 0x14, 0x76, 0x03, 0x45, 0x83, 0x6e, 0x8a, 0xb6, 0xf4, 0x66, 0x23, 0x31 }
 
+  # microvm serial port^M
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialUseMmio|FALSE
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialPciDeviceInfo|{0xFF}
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase|0x3f8
+
 ################################################################################
 #
 # Pcd Dynamic Section - list of all EDK II PCD Entries defined by this Platform
@@ -729,9 +736,7 @@
   #
   # ISA Support
   #
-  OvmfPkg/SioBusDxe/SioBusDxe.inf
-  MdeModulePkg/Bus/Pci/PciSioSerialDxe/PciSioSerialDxe.inf
-  MdeModulePkg/Bus/Isa/Ps2KeyboardDxe/Ps2KeyboardDxe.inf
+  MdeModulePkg/Universal/SerialDxe/SerialDxe.inf
 
   #
   # SMBIOS Support