OvmfPkg/VirtHstiDxe: add code flash check

Detects qemu config issue: code pflash is writable.
Checked for both PC and Q35.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Konstantin Kostiuk <kkostiuk@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>

OvmfPkg/VirtHstiDxe/VirtHstiDxe.c

@@ -104,9 +104,11 @@ VirtHstiOnReadyToBoot (
   switch (VirtHstiGetHostBridgeDevId ()) {
     case INTEL_82441_DEVICE_ID:
       VirtHstiQemuPCVerify ();
+      VirtHstiQemuCommonVerify ();
       break;
     case INTEL_Q35_MCH_DEVICE_ID:
       VirtHstiQemuQ35Verify ();
+      VirtHstiQemuCommonVerify ();
       break;
     default:
       ASSERT (FALSE);
@@ -142,9 +144,11 @@ VirtHstiDxeEntrypoint (
   switch (DevId) {
     case INTEL_82441_DEVICE_ID:
       VirtHsti = VirtHstiQemuPCInit ();
+      VirtHstiQemuCommonInit (VirtHsti);
       break;
     case INTEL_Q35_MCH_DEVICE_ID:
       VirtHsti = VirtHstiQemuQ35Init ();
+      VirtHstiQemuCommonInit (VirtHsti);
       break;
     default:
       DEBUG ((DEBUG_INFO, "%a: unknown platform (0x%x)\n", __func__, DevId));