OvmfPkg: RiscVVirt: Add missing SerialPortInitialize to Sec

If the SerialPortLib had any initialization needed, this
would be skipped in the RiscVVirt Sec. Follow the example
seen elsewhere (ArmVirtPkg PrePi).

Seen with BaseSerialPortLibRiscVSbiLibRam not using DBCN in Sec,
yet using DBCN elsewhere.

Cc: Daniel Schaefer <git@danielschaefer.me>
Signed-off-by: Andrei Warkentin <andrei.warkentin@intel.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>

OvmfPkg/RiscVVirt/Sec/SecMain.c

@@ -1,7 +1,7 @@
 /** @file
   RISC-V SEC phase module for Qemu Virt.
 
-  Copyright (c) 2008 - 2015, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2008 - 2023, Intel Corporation. All rights reserved.<BR>
   Copyright (c) 2022, Ventana Micro Systems Inc. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -57,6 +57,8 @@ SecStartup (
   UINT64                      StackBase;
   UINT32                      StackSize;
 
+  SerialPortInitialize ();
+
   //
   // Report Status Code to indicate entering SEC core
   //

OvmfPkg/RiscVVirt/Sec/SecMain.h

@@ -29,6 +29,7 @@
 #include <Library/PrePiLib.h>
 #include <Library/PlatformInitLib.h>
 #include <Library/PrePiHobListPointerLib.h>
+#include <Library/SerialPortLib.h>
 #include <Register/RiscV64/RiscVImpl.h>
 
 /**

OvmfPkg/RiscVVirt/Sec/SecMain.inf

@@ -48,6 +48,7 @@
   FdtLib
   MemoryAllocationLib
   HobLib
+  SerialPortLib
 
 [Ppis]
   gEfiTemporaryRamSupportPpiGuid                # PPI ALWAYS_PRODUCED