OvmfPkg: replace SECURE_BOOT_FEATURE_ENABLED with PcdSecureBootSupported

Drop the '-D SECURE_BOOT_FEATURE_ENABLED' compile time option,
use a new FeaturePcd instead.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

OvmfPkg/Library/NvVarsFileLib/NvVarsFileLib.c

@@ -28,14 +28,12 @@ ConnectNvVarsToFileSystem (
   IN EFI_HANDLE  FsHandle
   )
 {
- #ifdef SECURE_BOOT_FEATURE_ENABLED
-
-  return EFI_UNSUPPORTED;
-
- #else
-
   EFI_STATUS  Status;
 
+  if (FeaturePcdGet (PcdSecureBootSupported)) {
+    return EFI_UNSUPPORTED;
+  }
+
   //
   // We might fail to load the variable, since the file system initially
   // will not have the NvVars file.
@@ -52,7 +50,6 @@ ConnectNvVarsToFileSystem (
   }
 
   return Status;
- #endif
 }
 
 /**

OvmfPkg/Library/NvVarsFileLib/NvVarsFileLib.inf

@@ -47,6 +47,8 @@
 [Protocols]
   gEfiSimpleFileSystemProtocolGuid              ## CONSUMES
 
+[Pcd]
+  gUefiOvmfPkgTokenSpaceGuid.PcdSecureBootSupported
 
 [Guids]
   gEfiFileInfoGuid