OvmfPkg: move dsc and fdf include snippets for TPM support to subdirs

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

OvmfPkg/Include/Dsc/OvmfTpmSecurityStub.dsc.inc

@@ -0,0 +1,10 @@
+##
+#    SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+!if $(TPM2_ENABLE) == TRUE
+!if $(TPM1_ENABLE) == TRUE
+      NULL|SecurityPkg/Library/DxeTpmMeasureBootLib/DxeTpmMeasureBootLib.inf
+!endif
+      NULL|SecurityPkg/Library/DxeTpm2MeasureBootLib/DxeTpm2MeasureBootLib.inf
+!endif