IntelFsp2Pkg/GenCfgOpt.py: Support PCD input from command line

IntelFsp2Pkg/GenCfgOpt.py: Support PCD input from command line

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1231

Build system already support override PCD value by command
line so add this support to GenCfgOpt.py
Also update revision to 0.53

Test: Verified UPD header files generated can reflect different
      PCD values from --pcd build command input

Cc: Jiewen Yao <Jiewen.yao@intel.com>
Cc: Gao Liming <liming.gao@intel.com>
Cc: Zhu Yonghong <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Reviewed-by: Zhu Yonghong <yonghong.zhu@intel.com>