SecurityPkg Tcg2Config: Move common definitions to new Tcg2Internal.h

SecurityPkg Tcg2Config: Move common definitions to new Tcg2Internal.h

Common definitions are not consumed by VFR. They are not required to be
defined in Tcg2ConfigNvData.h with WA way. New shared internal header
file is added to include those common definitions.

Cc: Jian Wang <jian.j.wang@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Chao Zhang <chao.b.zhang@intel.com>