OvmfPkg/AmdSev/SecretDxe: make secret location naming generic

It is anticipated that this part of the code will work for both Intel
TDX and AMD SEV, so remove the SEV specific naming and change to
ConfidentialComputing as a more architecture neutral prefix. Apart
from the symbol rename, there are no code changes.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Message-Id: <20201216014146.2229-3-jejb@linux.ibm.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

OvmfPkg/Include/Guid/ConfidentialComputingSecret.h

@@ -0,0 +1,28 @@
+ /** @file
+   UEFI Configuration Table for exposing the SEV Launch Secret location to UEFI
+   applications (boot loaders).
+
+   Copyright (C) 2020 James Bottomley, IBM Corporation.
+   SPDX-License-Identifier: BSD-2-Clause-Patent
+ **/
+
+#ifndef CONFIDENTIAL_COMPUTING_SECRET_H_
+#define CONFIDENTIAL_COMPUTING_SECRET_H_
+
+#include <Uefi/UefiBaseType.h>
+
+#define CONFIDENTIAL_COMPUTING_SECRET_GUID              \
+  { 0xadf956ad,                                         \
+    0xe98c,                                             \
+    0x484c,                                             \
+    { 0xae, 0x11, 0xb5, 0x1c, 0x7d, 0x33, 0x64, 0x47 }, \
+  }
+
+typedef struct {
+  UINT64 Base;
+  UINT64 Size;
+} CONFIDENTIAL_COMPUTING_SECRET_LOCATION;
+
+extern EFI_GUID gConfidentialComputingSecretGuid;
+
+#endif // SEV_LAUNCH_SECRET_H_