SecuritPkg: Tcg2Smm: Add PlatformClass to TPM2 Table

SecuritPkg: Tcg2Smm: Add PlatformClass to TPM2 Table

Add PlatformClass info into TPM2 ACPI table, it is only valid with table
Rev 4 and later.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Yao Jiewen <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chao Zhang <chao.b.zhang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Yao Jiewen <jiewen.yao@intel.com>