OvmfPkg: fix OvmfTpmSecurityStub.dsc.inc include
TPM support is independent from secure boot support. Move the TPM
include snipped out of the secure boot !if block.
Fixes: b47575801e19 ("OvmfPkg: move tcg configuration to dsc and fdf include files")
Bugzilla: https://bugzilla.tianocore.org//show_bug.cgi?id=4290
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>