[Patch] SecurityPkg Tcg2Dxe: Add Variable Arch protocol dependency

["Liming Gao" <liming.gao@intel.com>]

commit a7e2d20193e853020a1415c25b53280955055394 introduces the code to
get PcdTpm2AcpiTableRev in the driver entry point. This PCD is designed as
DynamicHii or DynamicHiiEx PCD. So, this PCD depends on Variable service.
To make sure PcdTpm2AcpiTableRev value be got, add Variable service as Depex.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Signed-off-by: Liming Gao <liming.gao@intel.com>
---
 SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf
index c41c50a7a2..0127a31e97 100644
--- a/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf
+++ b/SecurityPkg/Tcg/Tcg2Dxe/Tcg2Dxe.inf
@@ -107,7 +107,11 @@
   gEfiSecurityPkgTokenSpaceGuid.PcdTpm2AcpiTableLasa                        ## PRODUCES
 
 [Depex]
-  TRUE
+  # According to PcdTpm2AcpiTableRev definition in SecurityPkg.dec
+  # This PCD should be configured at DynamicHii or DynamicHiiEx.
+  # So, this PCD read operation depends on GetVariable service.
+  # Add VariableArch protocol dependency to make sure PCD read works.
+  gEfiVariableArchProtocolGuid
 
 [UserExtensions.TianoCore."ExtraFiles"]
   Tcg2DxeExtra.uni
-- 
2.13.0.windows.1